Looks great and very clean and slick, but did you know the "Reply" and "Subscribe" buttons look broken on FF3. They are not vertically aligned correctly. Looks like a float problem.
EDIT: Attached a screenshot
EDIT 2: There is also a noticeable color difference from the gray in the logo and the gray below it and when you go to hover it from the bottom it ".org" to "Home" flickers a few times (looks like if you hover the very bottom of the logo image where the two grays meet) and it looks like gray from the logo gets longer.
Is possible to have a quick reply in the bottom like in vbulletin foruns ?. In long posts we have to navigate to the top to make the reply and for quicker answer it will be better to have the field already open.