[Update: I believe this is fixed now, thanks to Matt.]
Something upset rendering on Safari (the Mac browser) yesterday. In response I rolled back just about everything I could think of, except the Kerry-Edwards button in the left column, which I just can't believe is the source of the problem.
As a temporary measure, I'm also only putting one day's worth of comments on the 'front page'. Yesterday's interesting blog posts can be found here.
If you are a Safari user, please let me know if this page is now displaying properly.