MyDeathSpace

Here's one, I found this as I was looking for the articles for the blog the other day on MySpace & teens. This is a site that is "an archival site, containing news articles, online obituaries, and other publicly available information." it has sections on people from MySpace who have become deceased.
http://mydeathspace.com/

There's an article on it here:
http://informationweek.com/news/showArticle.jhtml?articleID=192500882