Some of you here already know that I work for an Israeli ISP. If you didn't, well know you know! A few months ago we suffered a major DDOS attack, which I wrote about here;
http://www.certifiedsecuritypro.com/forum/index.php/topic,302.0.htmlI don't know who was behind it, but I have my suspicions. I can assure you that it was of a scale and magnitude that leads me to beleive that it wasn't carried out by a small group or a single skiddie.

I'm not mentioning names, but I'm sure your imaginations will lead you down the same path mine does.