I’m one of those people whose Inbox slowly gets out of control. Here’s a good article on dealing with it: How to crank through your Gmail. (via Scoble) Of course, the trick for me is finding the time to do the initial cleanup.
I’ve actually almost managed it on my work Inbox. I got it to the stage where there is usually less than a screenful of emails. Virtually everything else goes into a folder called Inbox Archive, which is my Outlook equivalent of GMail’s archive. Of course, if I leave it unchecked for a day or two, the Inbox fills up again.
Got to keep at it constantly.