Twitter-like Load More Button
Here is a good example code for twitter like load more button in both jQuery and MooTools:
http://net.tutsplus.com/tutorials/javascript-ajax/create-a-twitter-like-load-more-widget/
I’ve tried MooTools version and worked fairly well (For IE, you need to remove the last comma in line 133 of mootools-version.php). Very easy to customize and the effect is great!