Amazon EC2 Core Docs
Friday, October 2nd, 2009EC2 API reference
Dev Guide
User Guide
http://awsdocs.s3.amazonaws.com/EC2/latest/ec2-api.pdf
http://awsdocs.s3.amazonaws.com/EC2/latest/ec2-ug.pdf
http://awsdocs.s3.amazonaws.com/EC2/latest/ec2-dg.pdf