Hey!
Thanks for the link, looks very well designed (nice colour scheming e.g.). Deuce is right though: on Firefox (Win) the main wrapper is skewed. Haven't tested it, but it seems like a "clear:both;" issue. Try adding this to your #main css rule (clear: both;). I think that might just fix it. Just let us know if you've applied it and we'll test it for you. As soon as I have chance I'll add your link to both the forum and example pages.
Thanks for posting!
Xander.
P.s.: your home link in the footer points to index.html, which can't be found...