Obama Conspiracy Theories has a new look as of today. The switchover has been made for primarily to fix some things (like nested comments!), but I was very impressed with the open feel of the text in this theme and the readability. Chris Wallace is the theme’s author (credits at the bottom of the page).
I would really like a bright white theme, more like a newspaper than a blog, but so far one that works and is typographically pleasing has eluded me.