Digg: I looked at this site - it seems to have a lot of fun articles, a lot of videos and photos, but wouldn't be my first choice if I was looking for news.
Reddit: I looked here too, but didn't stay.
Newsvine & Mixx: I liked these sites - they seem to have news.
Zombies, Schmombies! Teen Girls Are Vamping It Up! The New York Observer
I signed up for Mixx and shared the article above. I am excited to learn about yet another source of information that I have not made available to myself, but am somewhat overwhelmed by the idea of soooooo many sources of information - who has this kind of time, so I guess I see them as a productivity detractor. You could spend hours just checking out the various news sites - learn lots about the news, but not get much done.
I think that this would be great as a tool for students looking for current events or news articles - as long as they can stay focused.