I just built my first WordPress theme titled, "TheMightyMoo!". Right now it is makes more sense for it to be used for static CMS WordPress sites (i.e. not blogs), but could easily be ported over to a blog format, I suppose. :)
I am seeking feedback on both usability and functionality, so if you have a few free minutes, I would very much appreciate it if you gave it a test run and offered some constructive feedback.
It is listed under Creative Commons Attribution 3.0 Unported license.