jQuery Post Loader for WordPress Home Page

gistfile1.php

<?php
/*
Plugin Name: mfields.org - Ajax Append Posts
Plugin URI: 
Description:
Version: 0.1
Author: Michael Fields
Author URI: http://mfields.org/
Copyright 2010 Michael Fields  michael@mfields.org
License GPLv2
*/


function mfields_ajax_append_posts_jquery() {
	if ( is_home() ) {
		wp_enqueue_script( 'jquery' );
	}
}
add_action( 'wp_print_scripts', 'mfields_ajax_append_posts_jquery' );


function mfields_ajax_append_posts_query() {
	if( is_admin() ) {
		return false;
	}
	$response = array();
	if ( isset( $_GET['action'] ) && 'mfields_load_posts' === $_GET['action'] ) {
		
		global $query_string;
		query_posts( $query_string . '&paged=' . $_GET['paged'] );
		
		global $wp_query;
		$response['post_count'] = (int) $wp_query->post_count;
		
		if( have_posts() ) {
			ob_start();
			while( have_posts() ) {
				the_post();
				get_template_part( 'post', 'switchboard' );
			}
			$response['html'] = ob_get_contents();
			ob_end_clean();
		}
		else {
			$response['html'] = 'none';
		}
		print json_encode( $response );
		exit;
	}

	return;
}
add_action( 'init', 'mfields_ajax_append_posts_query' );


function mfields_ajax_append_posts_js() {
	if ( is_home() ) {
	print <<< EOF
<script type="text/javascript">
jQuery( document ).ready( function( $ ) {
	var page      = 1;
	var fetching  = false;
	var button    = $( '#mfields-load-posts' );
	var container = $( '#content' );
	function mfields_ajax_get_next_posts() {
		page++;
		fetching = true;
		$.ajax( {
			url      : document.location.href,
			data     : { 'action' : 'mfields_load_posts', 'paged' : page },
			type     : 'GET',
			dataType : 'json',
			cache    : false,
			success  : function( response ) {
				if ( 0 === response.post_count ) {
					button.remove();
				}
				else {
					container.append( response.html );
				}
			}
		} );
	};
	button.click( function () {
		mfields_ajax_get_next_posts();
	} );
});
</script>
EOF;
	}
}
add_action( 'wp_footer', 'mfields_ajax_append_posts_js' );