It looks very (pardon the pun) clean. Only thing I notice is the top menu wraps on a second line. I'm on Ubuntu, so I guess I'm not your typical visitor and probably don't have the fonts, but nevertheless: is this intentional?
(Your style sheet has this weird sequence of "font-family:"Trebuchet MS", verdana, arial, "Times New Roman", serif;", the two last one being very different from the first (serif vs sans-serif). Even if I change it to sans-serif the menu still wraps btw.)