Hmm. Something makes Firefox show a bottom scroll bar. I can scroll about half a centimeter. The size of the browser window doesn't matter. Tried with version 1.5.0.7 on DragonFly and with version 1.5.0.8 and 2.0 on a Windows comp. Opera 9.0 and IE works though (on Windows).
The style on the other side looks great, and the mail in archive seems synced to me. Well done! :-) Max