CNN just updated that link... confirms he's dead.

I think it's a pretty sure thing at this point, but for what it's worth, CNN still hasn't confirmed it, they're just reporting that others (LA Times and AP) are reporting it:

"CNN has not confirmed his death."

edit: they're now reporting on the broadcast that they have just confirmed it.

Twitter states otherwise:

http://search.twitter.com/search?q=michael+jackson

The last tweet about it is 14 minutes ago. The search page was refreshing with 1000 new tweets/5 seconds when I first heard the news. This is such a hot topic that Twitter can't keep up!

AP, LA Times, and other reputable sources saying he's dead.

bbc as well http://news.bbc.co.uk/2/hi/americas/8119951.stm