This is so minor I'm almost sorry to bother with it, but I thought I'd mention it since I could have just taken advantage of it. . .
You know how when you are addressing a PM and you start to type their name and you get a pop up list that keeps narrowing down as you type more? Would it be possible to add that ability to the "search members" function? When I try to find a member whose screenname I don't know exactly I have to scroll through page after page to find it. If we could start to type and get some choices to pop up, that would be very helpful!
Of course, if I am missing a quicker way of finding people I profusely apologize. I still think the pop-up thing is neat, though - and it would be nice on the archives when looking for authors, too.