Netflix uses more than one CDN, and, according to posts by their one of their architects (Adrian Cockroft http://perfcap.blogspot.com/ http://perfcap.blogspot.c

Netflix uses more than one CDN, and, according to posts by their one of their architects (Adrian Cockroft http://perfcap.blogspot.com/ http://perfcap.blogspot.com/), they use EC2 for everything but some basic in-house HR/backoffice stuff. He's got DOZENS of posts on how it works for them, how they full embraced ec2, etc. and how well it's working for them.