gistfile1.txt

if (!class_exists('SubHeading')) {
	class SubHeading
	{
		var $name = 'SubHeading';
		var $tag = 'subheading';
		var $meta_key;
		var $options = array();
		function SubHeading()
		{
			if ($options = get_option($this->tag)) {
				$this->options = $options;
			}	
			$this->meta_key = '_'.$this->tag;
			if (is_admin()) {
				add_action('admin_menu', array(&$this, 'meta'));
				add_action('save_post', array(&$this, 'save'));
				add_action('admin_menu', array(&$this, 'menu'));
				add_action('admin_init', array(&$this, 'settings_init'));
				if (isset($this->options['lists'])) {
					add_action('admin_enqueue_scripts', array(&$this, 'admin'), 10, 1);
				}
				add_filter('plugin_row_meta', array(&$this, 'settings_meta'), 10, 2);
				register_activation_hook(__FILE__, array(&$this, 'activate'));
				register_uninstall_hook(__FILE__, array(&$this, 'uninstall'));
			} else {
				add_filter('the_title_rss', array(&$this, 'rss'));
				add_filter('the_subheading', array(&$this, 'build'), 1);
				add_filter('the_content', array(&$this, 'prepend'));
				if (isset($this->options['search'])) {
					add_action('posts_where_request', array(&$this, 'search'));
				}
			}
		}
		function activate()
		{
			if (!$this->options) {
				update_option($this->tag, array(
					'search' => 1,
					'posts' => 1,
					'rss' => 1,
					'lists' => 1,
					'before' => '<h3>',
					'after' => '</h3>'
				));
			}
		}
		function uninstall()
		{
			$posts = get_posts(array(
				'numberposts' => -1,
				'post_type' => 'any',
				'meta_key' => $this->meta_key
			));
			foreach ($posts as $post) {
				delete_post_meta($post->ID, $this->meta_key);
			}
			update_option($this->tag, null);
		}
		function build($args)
		{
			extract($args);
			if ($value = $this->value($id)) {
				if (isset($this->options['tags'])) {
					$value = do_shortcode($value);
				}
				$subheading = $before.$value.$after;
				if ($display == true) {
					echo $subheading;
				} else {
					return $subheading;
				}
			}
			return null;
		}
		function meta()
		{
			$this->meta_box('page');
			if (isset($this->options['posts'])) {
				$this->meta_box('post');
			}
		}
		function meta_box($type='page')
		{
			add_meta_box(
				$this->tag.'_postbox',
				$this->name, array(&$this, 'panel'),
				$type,
				'normal',
				'high'
			);
		}
		function panel()
		{
			include_once('panel.php');
		}
		function save($post_id)
		{
			if (!isset($_POST[$this->tag.'nonce']) || !wp_verify_nonce($_POST[$this->tag.'nonce'], 'wp_'.$this->tag)) {
				return $post_id;
			}
			if (!current_user_can('edit_'.($_POST['post_type'] == 'page' ? 'page' : 'post'), $post_id)) {
				return $post_id;
			}
			$subHeading = wp_filter_kses($_POST[$this->tag.'_value']);
			if (empty($subHeading)) {
				delete_post_meta($post_id, $this->meta_key, $subHeading);
			} else if (!update_post_meta($post_id, $this->meta_key, $subHeading)){
				add_post_meta($post_id, $this->meta_key, $subHeading, true);
			}
		}
		function value($id=false)
		{
			global $post;
			return get_post_meta(($id !== false ? $id : $post->ID), $this->meta_key, true);
		}
		function rss($title)
		{
			if (isset($this->options['rss']) && $subHeading = $this->value()) {
				return $title.' - '.esc_html(strip_tags($subHeading));
			}
			return $title;
		}
		function prepend($content)
		{
			if (isset($this->options['append']) && $subHeading = $this->value()) {
				if (isset($this->options['before']) && isset($this->options['after'])) {
					return $this->options['before'].$this->value().$this->options['after'].$content;
				}
				return wpautop($this->value()).$content;
			}
			return $content;
		}
		function column_heading($columns)
		{
			$columns[$this->tag] = $this->name;
			return $columns;
		}
		function column_value($column_name, $post_id)
		{
			if ($column_name == $this->tag) {
				$this->build(array(
					'id' => $post_id,
					'before' => '',
					'after' => '',
					'display' => true
				));
			}
		}
		function admin($hook)
		{
			if ($hook == 'edit.php' || $hook == 'edit-pages.php' || $hook == 'plugins_page_subheading') {
				wp_enqueue_script($this->name, WP_PLUGIN_URL.'/'.$this->tag.'/admin.js');
				if ($hook != 'plugins_page_subheading') {
					add_filter('manage_pages_columns', array(&$this, 'column_heading'));
					add_filter('manage_pages_custom_column', array(&$this, 'column_value'), 10, 2);
					if (isset($this->options['posts'])) {
						add_filter('manage_posts_columns', array(&$this, 'column_heading'));
						add_filter('manage_posts_custom_column', array(&$this, 'column_value'), 10, 2);
					}
				}
			}
		}
		function menu()
		{
			add_submenu_page(
				'plugins.php',
				'Manage '.$this->name,
				$this->name,
				'administrator',
				$this->tag,
				array(&$this, 'settings_page')
			);
		}
		function settings_init()
		{
			register_setting(
				$this->tag.'_options',
				$this->tag,
				array(&$this, 'settings_validate')
			);
		}
		function settings_validate($inputs)
		{
			if (is_array($inputs)) {
				foreach ($inputs AS $key => $input) {
					if (in_array($key, array('before', 'after'))) {
						if (empty($inputs[$key])) {
							unset($inputs[$key]);
						} else {
							$inputs[$key] = format_to_post($inputs[$key]);
						}
					} else {
						$inputs[$key] = ($inputs[$key] == 1 ? 1 : 0);
					}
				}
				return $inputs;
			}
		}
		function settings_page()
		{
			add_action('admin_enqueue_scripts', array(&$this, 'admin'), 10, 1);
			include_once('settings.php');
		}
		function settings_meta($links, $file)
		{
			$plugin = plugin_basename(__FILE__);
			if ($file == $plugin) {
				return array_merge(
					$links,
					array(sprintf(
						'<a href="'.$_SERVER['PHP_SELF'].'?page=%s">%s</a>',
						$this->tag, __('Settings')
					))
				);
			}
			return $links;
		}
		function search($where)
		{
			if (is_search()) {
				global $wpdb, $wp;
				$where = preg_replace(
					"/\({$wpdb->posts}.post_title (LIKE '%{$wp->query_vars['s']}%')\)/i",
					"$0 OR ($wpdb->postmeta.meta_value $1)",
					$where
				);
				add_filter('posts_join_request', array(&$this, 'search_join'));
			}
			return $where;
		}
		function search_join($join)
		{
			global $wpdb;
			return $join .= " LEFT JOIN $wpdb->postmeta ON ($wpdb->postmeta.meta_key = '_{$this->tag}' AND $wpdb->posts.ID = $wpdb->postmeta.post_id) ";
		}
	}
	$subHeading = new SubHeading();
	if (isset($subHeading)) {
		function the_subheading($b='',$a='',$d=true,$i=false)
		{
			return apply_filters(
				'the_subheading',
				array('before'=>$b,'after'=>$a,'display'=>$d,'id'=>$i)
			);
		}
		function get_the_subheading($i=false,$b='',$a='')
		{
			return apply_filters(
				'the_subheading',
				array('before'=>$b,'after'=>$a,'id'=>$i)
			);
		}
	}
}

I am trying to figure out how to make this work with any post type.