When I check POTN, I usually do two things:
1) check recent posts -> works okay.
2) check posts I've posted in myself, by searching "posts by peterdoomen" in the CP.
For this second option, it would be useful to have an indication of who was the last person to post in a thread, so that I don't have to remember if I was the last person who posted in that thread.
An idea for an extra feature? I admit it is "nice to have" rather than "must have", still it would be, well, "nice".