Fark.com
Interesting, bizarre and amusing news stories, along with regular photo manipulation contests.
http://www.fark.com/

Reddit
User-generated news links. Votes promote stories to the front page.
http://reddit.com/

Workdig
Community posting headline links to career-related topics and videos.
http://www.workdig.com/

State Of Brain
User-run news site with voting marked by emotion icons. Users control the site with link submissions and the power to vote.
http://www.stateofbrain.com/

Crappr.com
Join to share the worst, weird, and strange news.
http://crappr.com/