I am reviewing some WordPress Theme Frameworks right now, hoping to play with each one to see how easy they are to customize.
The frameworks I have investigated so far are:
Each framework provides the developer with a basic version of a theme, some with comments and documentation on how to build a theme from scratch. I have been playing with Thematic most of all (I am currently using the default Thematic theme) but I am currently editing a new theme using Sandbox.
I’ll let you know how it goes as I get more done.