Popurls: One could argue that this is the only site you need. Popurls constantly revolves the most popular stories of the hour. It displays feeds from Digg, del.icio.us, reddit, Newsvine, Metafilter, Tailrank, Google News, Yahoo News, Netscape, You Tube, Shoutwire, Slashdot, Wired, Fark, Furl, Heavy.com, Wired and Flickr.

LiveMarks: Scrolling list of Bookmarks as they are made. When I bookmark some story on del.icio.us, Livemarks shows the URL title and also shows the most popular items. You can also setup tag filters so you don't see "New BBQ recipes" or whatever.