That only took 21 months since I asked them nicely. What I don’t like about what I’ve read so far is that they are not using a lazy-loading proxy (ala Akamai, EdgeCast, Panther) and are instead opting for S3 as the content origin. That sucks, because it basically means that you have to do something in order to get your content onto their network. With a lazy-loading proxy, you just tell your CDN provider to effectively make static.whatever.com a mirror of www.whatever.com. It’s much simpler.