I’m currently using Carrington Blog, which has a layout structure I like, but will be switching to Twenty Ten once 3.0 is officially released. I’m using the 3.0 release candidates on my test sites, but this one drew the short straw for me to use as a sample of what 2.9 looks like.
I’m misusing Carrington as a finished theme when I think it’s really a theme framework. I had thought about Thematic, which is also a framework with maybe a more standard file structure. It also has some nice resources for modifying it, generally and using child themes.
Nothing against Carrington or Thematic; just don’t have the time right now for frameworks as I’m concentrating more on content and content types.