PHP programming exercises for anyone new to programming or PHP. You start with a suite of failing tests and begin to add code so the tests pass and gradually learn the basics of programming in the process. This is in progress and I'm actively working on finishing it.
Crumbum Expression Engine Plugin
I really dig Expression Engine for building CMS driven websites and couldn't find a plugin that did exactly what I needed. This plugin handles automatic breadcrumb generation for anyone using the Pages Module in Expression Engine.