The NETTUTs site has a new tutorial posted today with instruction of how to create a simple shoutbox-style mini-app for your site.

In this tutorial, we will be creating a basic 'Shoutbox' system with PHP. Aimed at beginners to PHP development, this allows you to get your feet wet working with databases before moving on to some of the more advanced PHP tutorials here at NETTUTS.

You provide the environment and they provide everything else - the code, the database structure and an explanation of how they all fit together. There's even a demo of the end result in action.