Amazon data center size(Edit 3/16/2012: I am surprised that this post is picked up by a lot of media outlets. Given the strong interest, I want to emphasize what is measured and what is derived. The # of server racks in EC2 is what I am directly observing. By assuming 64 physical servers in a rack, I can derive the rough server count. But remember this is an *assumption*. Check the comments below that some think that AW
