On NETTUTS.com there's a new tutorial they've created showing the development of a "load more" component for your page combining PHP, MySQL and a javascript library (like Mootools or jQuery).

Both Twitter and the Apple App Store use a brilliant technique for loading more information; you click the link and fresh items magically appear on the screen. This tutorial teaches you to use AJAX, CSS, Javascript, JSON, PHP, and HTML to create that magic. This tutorial will also feature both jQuery and MooTools versions of the script.

The idea is that, after the initial load of the page, the user can click on the "load more" link/button and the Ajax request will get the latest results from the backend (via json messaging). The complete code is available for download and you can check out the demo if you'd like to see it in action.

NETTUTS.com has a new tutorial posted today showing how to combine some simple PHP scripts with the MooTools Javascript library to emulate the popular social site Twitter.

People all over the world love Twitter because of how easy it is to use. All you need to do is type in your current status, click "Update", and you're done. What most people probably don't know is how simple it is to emulate Twitter's functionality. Using PHP, MySQL, and MooTools javascript, you can implement a Twitter-like status system in no time.

Their mini-application (download the source here) creates a basic input box and a list of messages below. The MooTools library is used to send the message back to the PHP script and update the messages list with the latest from the current user. Complete code and screenshots of examples are included.