Digg.com has been around for about 2 years. It has over 1 million users. The concept is user driven news. Someone submits an article, picture set or website and the community votes one what they like. The top stories end up on the homepage. People can browse the top stories in the past 24 hours, week, month or year.
I browse this site constantly at work to pass time. Articles tend to be very techie because the people who sign up to vote on stories are typically male IT geeks. The site founder and his close friend host a podcast called Diggnation which review the top stories of the week with humor.
Final Word: A great place to waste time. News voted by the people for the people. Something worth checking on a daily bases.