This is a real issue for me. My site has users that come and view but don't post. I used to be able to list when they came to the site. Now I have no ability to monitor members that stop by but don't post. It's very beneficial to new and smaller boards.
Ah, glad I found this thread (thanks Brogan). I too would really appreciate being able to sort by a few crieria, last post, post count, date joined, etc being among the most important. I routinely viewed my memberlist in this way prior to my move over to xF, and I miss it. *fingers crossed* =)