Firefox
After being reminded by a comment that I had not done a very thorough job of designing the site to be cross-browser compatible, I went back and cleaned up some of my CSS so that the site renders correctly in Firefox.
For anyone who's been living under a rock, Firefox, built on the same technology behind the old Netscape Navigator, is the first real competitor to IE available for the Windows platform since IE's domination of the browser market. And it's a good thing; IE hasn't had a major release since 2001 and they have only now announced that IE7 is coming.
Shame on Microsoft for resting on their laurels. This only proves what the anti-Microsoft camp have been saying for years: that one company controlling so much of the technology we use will stifle advancement. It has. I have always defended Microsoft as a savvy company that is hated because it is successful, but it took Mozilla's unflagging commitment to the technology to force them to advance.
By the way... I have not checked the site under Safari yet, so any Safari users out there, please let me know if you have any problems.