I just discovered to my horror that the Drupal theme I've been using does not work with IE 7.
My apologies to visitors who have visited this site and seen a mess. Personally I use Firefox but I did not intend to force everyone visiting this site to use the same browser that I do.
I've switched to Bluemarine instead. I don't like it as much as the previous theme but at least it appears to work with IE 7. Please tell me if you still see any display problems.