My biggest issue is that after posting a reply in a thread, it takes me to the "last" page of the thread. Since I (and most frequent posters I know) have the "newest first" flag set, that means it takes me back to post #1 instead of staying with the most recent posts.
I'd also love it if you could fix the big with # - it should not automatically convert that to a link and force me to edit the reply every time I use it.