As many of you know, I am a big fan of the Code Igniter Framework.  It is very light weight and has many things to offer out of the box.  I have had the pleasure of using this framework on 3 huge projects.  I will be posting a lot more thought about the Code Igniter framework, specifically on different parts of their library.  Until then, check out these existing Code Igniter websites.

http://codeigniter.com/projects/