There is another alternative bot-net
but this one is pure speculation. The only entity that I can think of
that would have the resources to create an effective Distributed
Denial Of Service Attack, without having to resort to hijacking
peoples computers, is none other than the government.

http://www.associatedcontent.com/article/6064458/ddos_attack_on_wikileaks_failed_to.html?cat=15

Bring it on