I hope this is a good place to put this thread.
Lyle, congrats on the forum upgrade!
One bit of immediate feedback: the bright green makes my eyes bleed, especially when looking at the forum home page. Can try you "desaturating" that? Currently you've got it at around 00CC00, make it more like 66CC66? Against the white background I promise it will still jump out as "green".
Second bit of feedback: the text flow around in-thread advertisements is busted. If there's an ad among the thread comments, the text of the comment gets shoved to the extreme right edge by a ton of whitespace. Firefox 3.6.10 on Windows XP.