This suggestion might have been made already, but I don't think so. It would be great to see the original message when one offers a reply. Its a pain to fire up another window to view the original. Using the browser forward and back buttons is a also a pain and recipie for blank posts.
I've just gotten into the habit of opening all links
as "Open in New Window" but this would be a very nice feature.
Also, sometimes after you submit you get to see your own
formatted post and the textarea edit box for changes, but
sometimes you only get the textarea box.