Google went down for over a half hour for some users due to the weight of traffic, and many were receiving the message "Your query looks similar to automated requests from a computer virus or spyware application". The search term "Michael Jackson Died" had bombarded Google's servers so fast, so frequently, and in such a volume that it's automated system shut down the keyword. It wasn't until the term was manually released that users could receive their news on M.J.'s death again. Google trends described the "Hotness" of the search term as volcanic: http://www.google.com/trends/hottrends?q=michael+jackson+died&date=2009-6-26&sa=X 7 of the top 10 searches had something to do with Michael Jackson throughout the day.
The Michael Jackson Wikipedia page also had to be brought down do to the increased traffic and the bombardment of requests to update the page. As conflicting news reports were released, users and fans began an editing war on his page trying to get the latest and correct information up.
Twitter also crashed (not a big surprise actually), with unconfirmed reports stating that there were 66,500 tweets containing the words "Michael Jackson" within an hour of the first news of his hospitalization. Supposedly twitter registered that M.J. based tweets were 15% of the global total yesterday, the highest ever single subject tweet volume.
TMZ.com broke the news, and later that night broke itself when the traffic became too much for it to handle. The LA Times was the first to confirm the reports, and also succumbed to the influx of traffic shortly after.
One site that managed not to break was Bing. But, that's because Bing didn't pick up on the story for hours after the event.
While I think M.J.'s lifestyle and choices became somewhat questionable later in life, I can't deny that his talent and music were a large part of my childhood and he will be sorely missed by millions. Rest in Peace M.J., you left your mark in more ways than we ever thought you could.