( blogdex ) is a MIT Media Lab project that scans weblogs and posts the top ten most popular links over the last 24 hours or so. It's still can't be that many yet -- if the top site for the last 24 hours appears by only getting 4 links, all it takes is a couple of friends to conspire...

(I don't think I'm being scanned by them yet, but I can't be sure, and haven't looked that hard...)