On NETTUTS.com today there's a new tutorial introducing you to the world of WordPress plugins by helping your create your first plugin - an optimization plugin that will help with things like page load time and general SEO.
This tutorial is going to assume that you have at least a beginner's understanding of PHP and the WordPress syntax. Though we'll be covering everything, some knowledge beforehand will help you grasp the concepts much more easily. I'll also assumes that you have a WP blog setup and ready to go.
The plugin takes out useless meta tags, unloads unneeded filters and handles some SEO work like adding tags and an excerpt into the post's header information. The break the plugin down into the different parts and include the code to get each of them working including a call to optimize all of the tables in your current WordPress install's database.