I agree with Simon's list with two minor exceptions.
1. #4 I'd like to be able to make individual forums language specific. This would encourage those who speak that language to talk in areas where others will understand them.
(I'm bilingual but my gawd, there are too many languages supported!)
2. No pop up instructions unless it is optional. (pop-ups are annoying, imho)
and a new item: better documentation (please)
thanks,
Bridgette