Modify Wordpress Post Formats and display them as a horizontal tab bar along the top of the post editor page.

format-audio.php

<div class="post-editor-block" id="post-editor-audio-fields" style="display: none;">
	<label for="post-editor-audio-embed"><?php _e('Audio URL (oEmbed) or Embed Code', 'post-format'); ?></label>
	<textarea name="_format_audio_embed" id="post-editor-audio-embed" tabindex="1"><?php echo esc_textarea(get_post_meta($post->ID, '_format_audio_embed', true)); ?></textarea>
</div>	

format-gallery.php

<div id="post-editor-gallery-preview" class="post-editor-block post-editor-block-image" style="display: none;">
	<label><span><?php _e('Gallery Images', 'post-format'); ?></span></label>
	<div class="post-editor-container">

<?php

// running this in the view so it can be used by multiple functions

$attachments = get_posts(array(
	'post_type' => 'attachment',
	'numberposts' => -1,
	'post_status' => null,
	'post_parent' => $post->ID,
	'order' => 'ASC',
	'orderby' => 'menu_order ID',
));
if ($attachments) {
	echo '<ul class="gallery">';
	foreach ($attachments as $attachment) {
		echo '<li>'.wp_get_attachment_image($attachment->ID, 'thumbnail').'</li>';
	}
	echo '</ul>';
}

?>
<p class="none"><a href="#" class="button"><?php _e('Upload Images', 'post-format'); ?></a></p>
	</div>
</div>

format-link.php

<div class="post-editor-block" id="post-editor-link-url" style="display: none;">
	<label for="post-editor-link-url-field"><?php _e('URL (enter the URL of another page and it will be embedded in the right-side column)', 'post-format'); ?></label>
	<input type="url" name="_format_link_url" value="<?php echo esc_attr(get_post_meta($post->ID, '_format_link_url', true)); ?>" id="post-editor-link-url-field" size="80" tabindex="1" />
</div>	

format-quote.php

<div id="post-editor-quote-fields" style="display: none;">
	<div class="post-editor-block">
		<label for="post-editor-quote-source-name"><?php _e('Source Name', 'post-format'); ?></label>
		<input type="text" name="_format_quote_source_name" value="<?php echo esc_attr(get_post_meta($post->ID, '_format_quote_source_name', true)); ?>" id="post-editor-quote-source-name" tabindex="1" />
	</div>
	<div class="post-editor-block">
		<label for="post-editor-quote-source-url"><?php _e('Source URL', 'post-format'); ?></label>
		<input type="text" name="_format_quote_source_url" value="<?php echo esc_attr(get_post_meta($post->ID, '_format_quote_source_url', true)); ?>" id="post-editor-quote-source-url" tabindex="1" />
	</div>
</div>

format-video.php

<div class="post-editor-block" id="post-editor-code-fields" style="display: none;">
	<label for="post-editor-gist-url"><?php _e('URL (enter the Gist share URL)', 'post-format'); ?></label>
	<input type="url" name="_format_gist_url" value="<?php echo esc_attr(get_post_meta($post->ID, '_format_gist_url', true)); ?>" id="post-editor-gist-url" size="80" tabindex="1" />

	<label for="post-editor-code-inline"><?php _e('Plain Text Code (Gist is recommended, for improved formatting and highlighting)', 'post-format'); ?></label>
	<textarea name="_format_code_inline" id="post-editor-code-inline" tabindex="1"><?php echo esc_textarea(get_post_meta($post->ID, '_format_code_inline', true)); ?></textarea>
</div>	

post-formats.js

jQuery(function($) {
	var CF = CF || {};
	
	CF.postFormats = function($) {
		return {
			switchTab: function(clicked) {
				var $this = $(clicked),
					$tab = $this.closest('li');

				if (!$this.hasClass('current')) {
					$this.addClass('current');
					$tab.siblings().find('a').removeClass('current');
					this.switchWPFormat($this.attr('href'));
				}
			},
			
			switchWPFormat: function(formatHash) {
				$(formatHash).trigger('click');
				switch (formatHash) {
					case '#post-format-0':
					case '#post-format-aside':
					case '#post-format-chat':
						CF.postFormats.standard();
						break;
					case '#post-format-status':
					case '#post-format-link':
					case '#post-format-image':
					case '#post-format-gallery':
					case '#post-format-video':
					case '#post-format-quote':
					case '#post-format-audio':
						CF.postFormats[formatHash.replace('#post-format-', '')]();
				}
				$(document).trigger('post-formats-switch', formatHash);
			},

			standard: function() {
				$('#post-editor-link-url, #post-editor-quote-fields, #post-editor-code-fields, #post-editor-audio-fields, #post-editor-gallery-preview').hide();
				$('#titlewrap').show();
				$('#postimagediv-placeholder').replaceWith($('#postimagediv'));
			},
			
			status: function() {
				$('#titlewrap, #post-editor-link-url, #post-editor-quote-fields, #post-editor-code-fields, #post-editor-audio-fields, #post-editor-gallery-preview').hide();
				$('#postimagediv-placeholder').replaceWith($('#postimagediv'));
				$('#content:visible').focus();
			},

			link: function() {
				$('#post-editor-quote-fields, #post-editor-code-fields, #post-editor-audio-fields, #post-editor-gallery-preview').hide();
				$('#titlewrap, #post-editor-link-url').show();
				$('#postimagediv-placeholder').replaceWith($('#postimagediv'));
			},
			
			image: function() {
				$('#post-editor-link-url, #post-editor-quote-fields, #post-editor-code-fields, #post-editor-audio-fields, #post-editor-gallery-preview').hide();
				$('#titlewrap').show();
				$('#postimagediv').after('<div id="postimagediv-placeholder"></div>').insertAfter('#titlediv');
			},

			gallery: function() {
				$('#post-editor-link-url, #post-editor-quote-fields, #post-editor-code-fields, #post-editor-audio-fields').hide();
				$('#titlewrap, #post-editor-gallery-preview').show();
				$('#postimagediv-placeholder').replaceWith($('#postimagediv'));
			},

			video: function() {
				$('#post-editor-link-url, #post-editor-quote-fields, #post-editor-gallery-preview, #post-editor-audio-fields').hide();
				$('#titlewrap, #post-editor-code-fields').show();
				$('#postimagediv-placeholder').replaceWith($('#postimagediv'));
			},

			quote: function() {
				$('#titlewrap, #post-editor-link-url, #post-editor-code-fields, #post-editor-audio-fields, #post-editor-gallery-preview').hide();
				$('#post-editor-quote-fields').show().find(':input:first').focus();
				$('#postimagediv-placeholder').replaceWith($('#postimagediv'));
			},

			audio: function() {
				$('#post-editor-link-url, #post-editor-quote-fields, #post-editor-code-fields, #post-editor-gallery-preview').hide();
				$('#titlewrap, #post-editor-audio-fields').show();
				$('#postimagediv-placeholder').replaceWith($('#postimagediv'));
			}

		};
	}(jQuery);
	
	// move tabs in to place
	$('#post-format-tabs').insertBefore($('form#post')).show();
	$('#post-editor-link-url, #post-editor-code-fields, #post-editor-audio-fields').insertAfter($('#titlediv'));
	$('#post-editor-gallery-preview').find('dt a').each(function() {
		$(this).replaceWith($(this.childNodes)); // remove links
	}).end().insertAfter($('#titlediv'));
	$('#post-editor-quote-fields').insertAfter($('#titlediv'));
	
	$(document).trigger('post-formats-init');
	
	// tab switch
	$('#post-format-tabs').find('a').live('click', function(e) {
		CF.postFormats.switchTab(this);
		e.stopPropagation();
		e.preventDefault();
	}).filter('.current').each(function() {
		CF.postFormats.switchWPFormat($(this).attr('href'));
	});

	// WordPress 3.5 compatibility
	// props: https://gist.github.com/4192094
	
	var postId = $('#post_ID').val();
	var gallery = wp.media.query({ uploadedTo: postId });

	gallery.more();

	gallery.on( 'add remove reset', function() {
		var $preview = $('#post-editor-gallery-preview');
		$preview.find('.post-editor-container').html('<p><img src="' + post_editor_format.wpspin_light + '" alt="' + post_editor_format.loading + '" /></p>');
		$.post(
			ajaxurl,
			{
				'action': 'post_editor_gallery_preview',
				'id': $('#post_ID').val()
			},
			function(response) {
				$preview.replaceWith(response.html);
				$preview = $('#post-editor-gallery-preview');
				$preview.find('dt a').each(function() {
					$(this).replaceWith($(this.childNodes)); // remove links
				}).end();
				if ($('#post-format-tabs').find('a.current').attr('href').indexOf('#post-format-gallery') != -1) {
					$preview.show();
				}
			},
			'json'
		);

	}, gallery );

	
	$('#post-editor-gallery-preview').find('.none a').live('click', function(e) {
		$('#wp-content-media-buttons').find('.insert-media').mousedown().mouseup().click();
		e.preventDefault();
	});

});

post-formats.php

<?php

function post_editor_admin_init() {
	$post_formats = get_theme_support('post-formats');
	if (!empty($post_formats[0]) && is_array($post_formats[0])) {
		if (in_array('link', $post_formats[0])) {
			add_action('save_post', 'post_editor_format_link_save_post');
		}
		if (in_array('status', $post_formats[0])) {
			add_action('save_post', 'post_editor_format_status_save_post', 10, 2);
		}
		if (in_array('quote', $post_formats[0])) {
			add_action('save_post', 'post_editor_format_quote_save_post', 10, 2);
		}
		if (in_array('video', $post_formats[0])) {
			add_action('save_post', 'post_editor_format_video_save_post');
		}
		if (in_array('audio', $post_formats[0])) {
			add_action('save_post', 'post_editor_format_audio_save_post');
		}
	}
}
add_action('admin_init', 'post_editor_admin_init');

function post_editor_add_meta_boxes($post_type) {
	if (post_type_supports($post_type, 'post-formats') && current_theme_supports('post-formats')) {
		wp_enqueue_script('post-formats', LITHO_JSINC .'post-formats.js', array('jquery'));
		wp_enqueue_style('post-formats',  LITHO_CSSINC . 'admin.css');

		wp_localize_script(
			'post-formats','post_editor_format',
			array('loading' => __('Loading...', 'post-formats'),'wpspin_light' => LITHO_URL . ('/core/images/wpspin_light.gif')
			)
		);

		add_action('edit_form_after_title', 'post_editor_post_admin_setup');
	}
}
add_action('add_meta_boxes', 'post_editor_add_meta_boxes');

function post_editor_post_admin_setup() {
	$post_formats = get_theme_support('post-formats');

	if (!empty($post_formats[0]) && is_array($post_formats[0])) {
		global $post;
		$current_post_format = get_post_format($post->ID);

		if (!empty($current_post_format) && !in_array($current_post_format, $post_formats[0])) {
			array_push($post_formats[0], get_post_format_string($current_post_format));
		}
		array_unshift($post_formats[0], 'standard');
		$post_formats = $post_formats[0];

		include( 'formats/tabs.php' );

		$format_views = array(
			'link',
			'video',
			'gallery',
			'audio',
		);
		foreach ($format_views as $format) {
			if (in_array($format, $post_formats)) {
				include('formats/format-'.$format.'.php');
			}
		}
	}
}

function post_editor_format_link_save_post($post_id) {
	if (!defined('XMLRPC_REQUEST') && isset($_POST['_format_link_url'])) {
		update_post_meta($post_id, '_format_link_url', $_POST['_format_link_url']);
	}
}
// action added in post_editor_admin_init()

function post_editor_format_auto_title_post($post_id, $post) {
	// get out early if a title is already set
	if (!empty($post->post_title)) {
		return;
	}

	remove_action('save_post', 'post_editor_format_status_save_post', 10, 2);
	remove_action('save_post', 'post_editor_format_quote_save_post', 10, 2);

	$content = trim(strip_tags($post->post_content));
	$title = substr($content, 0, 50);
	if (strlen($content) > 50) {
		$title .= '...';
	}
	$title = apply_filters('post_editor_format_auto_title', $title, $post);
	wp_update_post(array(
		'ID' => $post_id,
		'post_title' => $title
	));

	add_action('save_post', 'post_editor_format_status_save_post', 10, 2);
	add_action('save_post', 'post_editor_format_quote_save_post', 10, 2);
}

function post_editor_format_status_save_post($post_id, $post) {
	if (has_post_format('status', $post)) {
		post_editor_format_auto_title_post($post_id, $post);
	}
}
// action added in post_editor_admin_init()

function post_editor_format_quote_save_post($post_id, $post) {
	if (!defined('XMLRPC_REQUEST')) {
		$keys = array(
			'_format_quote_source_name',
			'_format_quote_source_url',
		);
		foreach ($keys as $key) {
			if (isset($_POST[$key])) {
				update_post_meta($post_id, $key, $_POST[$key]);
			}
		}
	}
	if (has_post_format('quote', $post)) {
		post_editor_format_auto_title_post($post_id, $post);
	}
}
// action added in post_editor_admin_init()

function post_editor_format_video_save_post($post_id) {
	if (!defined('XMLRPC_REQUEST') && isset($_POST['_format_code_inline'])) {
		update_post_meta($post_id, '_format_code_inline', $_POST['_format_code_inline']);
	}
	if (!defined('XMLRPC_REQUEST') && isset($_POST['_format_gist_url'])) {
		update_post_meta($post_id,'_format_gist_url', $_POST['_format_gist_url']);
	}
}
// action added in post_editor_admin_init()

function post_editor_format_audio_save_post($post_id) {
	if (!defined('XMLRPC_REQUEST') && isset($_POST['_format_audio_embed'])) {
		update_post_meta($post_id, '_format_audio_embed', $_POST['_format_audio_embed']);
	}
}
// action added in post_editor_admin_init()

function post_editor_gallery_preview() {
	if (empty($_POST['id']) || !($post_id = intval($_POST['id']))) {
		exit;
	}
	global $post;
	$post->ID = $post_id;
	ob_start();
	include( 'formats/format-gallery.php' );
	$html = ob_get_clean();
	header('Content-type: text/javascript');
	echo json_encode(compact('html'));
	exit;
}
add_action('wp_ajax_post_editor_gallery_preview', 'post_editor_gallery_preview');

function post_editor_post_has_gallery($post_id = null) {
	if (empty($post_id)) {
		$post_id = get_the_ID();
	}
	$images = new WP_Query(array(
		'post_parent' => $post_id,
		'post_type' => 'attachment',
		'post_status' => 'inherit',
		'posts_per_page' => 1, // -1 to show all
		'post_mime_type' => 'image%',
		'orderby' => 'menu_order',
		'order' => 'ASC'
	));
	return (bool) $images->post_count;
}

function post_editor_pre_ping_post_links($post_links, $pung, $post_id = null) {
	// return if we don't get a post ID (pre WP 3.4)
	if (empty($post_id)) {
		return;
	}
	$url = get_post_meta($post_id, '_format_link_url', true);
	if (!empty($url) && !in_array($url, $pung) && !in_array($url, $post_links)) {
		$post_links[] = $url;
	}
}
add_filter('pre_ping', 'post_editor_pre_ping_post_links', 10, 3);

// For integration with Social plugin (strips {title} from broadcast format on status posts)
function post_editor_social_broadcast_format($format, $post) {
	if (get_post_format($post) == 'status') {
		$format = trim(str_replace(array('{title}:','{title} -','{title}',),'',$format));
	}
	return $format;
}
add_filter('social_broadcast_format', 'post_editor_social_broadcast_format', 10, 2);

tabs.php

<div id="post-format-tabs" class="nav" style="display: none;">
	<ul class="clearfix">
		<?php

		foreach ( $post_formats as $format ) {
			$class = ( $format == $current_post_format || ( empty( $current_post_format ) && $format == 'standard' ) ?
				'current' : '' );
			if ( $format == 'standard' ) {
				$format_string = __( 'Standard', 'post-format' );
				$format_hash   = 'post-format-0';
			} else {
				$format_string = get_post_format_string( $format );
				$format_hash   = 'post-format-' . $format;
			}

			if ( $format_string == 'Link' ) {
				$format_string = 'External';
			} elseif ( $format_string == 'Image' ) {
				$format_string = 'Gallery';
			} elseif ( $format_string == 'Video' ) {
				$format_string = 'Code';
			} elseif ( $format_string == 'Audio' ) {
				$format_string = 'Horizontal';
			} elseif ( $format_string == 'Chat' ) {
				$format_string = 'Single';
			}

			echo '<li><a ' . ( ! empty( $class ) ? 'class="' . esc_attr( $class ) . '"' :
					'' ) . ' href="#' . esc_attr( $format_hash ) . '">' . esc_html( $format_string ) . '</a></li>';
		}

		?>
	</ul>
</div>