I don't know if I'm risking a big flaming here, but I am on another online forum which is so much more user-friendly (its Ravelry if anyone's on it too.
You can tell at a glance who has replied to your posts and in which thread.
People can 'earburn' you if they think you could have some useful input into a topic (instead of you finding out days later when there's no point any more).
You can mention/thank people by earburning them which is nice.
You can instantly see how many times each person has posted on a thread and so (for example) see all the posts by the OP instead of trawling through a huge thread trying to get an update.
There are loads of other things (post statistics, search facility) but I don't want to bore anyone.
I know people hate change but it would really improve things IMHO.
AIBU?