The people who brought you the amazing Wikipedia today launched Wikinews. The first news site I know of where the users collaboratively write and edit the news content. I hear that the content will be a little sparse as it launches, but it will be exciting to see how things fare as things fall in stride.
For those who don't know what a Wiki is, essentially it's a sort of collaborative content site that lets anyone edit any and all of the content. Its a pretty amazing type of collaboration which has given us over a million articles in the Wikipedia.