For Cloud server vulnerability sceptics ....

According to the press did you realise that Amazon is almost impossible to crash with a DDoS attack

The website-attacking group "Anonymous" tried and failed to take down Amazon.com on Thursday. The group's vengeance horde quickly found out something techies have known for years: Amazon, which has built one of the world's most invincible websites, is almost impossible to crash.

http://money.cnn.com/2010/12/09/technology/amazon_wikileaks_attack/