If you are a news junkie, this is for you.
Michael likes Diggdot.us, but I prefer a similar service; SearchFox.com. The advantage of SearchFox is the ability to choose the RSS feeds that are merged by the service. This allows integration not only of Digg, Slashdot and del.icio.us/popular, but other favorite sites as well. SearchFox takes the additional step of using AI to prioritize the stories in order of your reading preferences, so I get what I really care about filtered to the top of the feeds whenever I log on to SearchFox.