Random note on on scale-out, caching, etc: check out CloudFront's "whole site delivery". You can set min TTLs to zero on CloudFront, configure your cache heade

Random note on on scale-out, caching, etc: check out CloudFront's "whole site delivery". You can set min TTLs to zero on CloudFront, configure your cache headers correctly and get many of the benefits outlined in the article. See: http://www.allthingsdistributed.com/2012/05/cloudfront-dynamic-content-support.html http://blogs.gartner.com/lydia_leong/2012/05/14/amazon-cloudfront-gets-whole-site-delivery-and-acceleration/ WARNING: CloudFront will dutifully cache non-2xx responses, so you can get a long-lived, but very fast, 500 response...