Advanced Navigation II using Clean Urls
This tutorial will teach you how to implement clean SEO friendly web URLs. Example: Turning /index.php?page=register into http://www.domain.com/register/.
Advanced Navigation using Includes
A very simple way of doing the index.php?page=page_here. Includes a few configuration options. Written in php4, works in php5, mostly so you can view the source and attempt at understanding how it works.