Shameless plug for Google Web Toolkit. Since core design principle is dynamic site generation client side from permutations (i.e. locales and languages) created

Shameless plug for Google Web Toolkit. Since core design principle is dynamic site generation client side from permutations (i.e. locales and languages) created at compile time, you can deploy the entire thing as static files to S3. That's what I do :) The only trick is to leave a foo XHR response in your R53 failover so that a running instance of your app can realize the server is tits up and degrade gracefully. For even better caching throw in webapp manifest files too!