Don’t know how many times I have to post this... it was Anonymous. I saw them talking about it early this morning on twitter before it started. It’s their message to whoever that if Assange goes down so does the internet. It was a show of support for Assange/Wikileaks.
If they want to take down the Internet they need to take down Level 3, OpenDNS, VeriSign and Google DNS servers. Then all h*** will break loose.