iUseThis is a new site which can be best described as an union between digg and MacUpdate. The front page of the site displays a listing of the most recent updates for OS X software. Registered users can click on the applications they use to, in a sense "voting" for them. The more people using an application, the higher up on the page it is. This lets visitors easily see the most popular software releases at a glance.
Looks pretty cool and could be a valuable resource. The tags implementation is really useful but I'm suprised to see Quicksilver with 434 users and Launchbar with only 35 - Ah well, 36 now!
Note: - The site is getting a lot of traffic so may need a restart or two - Hope they can cope with the demand!