Care to elaborate a little about how well static content works for you? I'm working on something where I was thinking about using S3 for static and building a

Care to elaborate a little about how well static content works for you? I'm working on something where I was thinking about using S3 for static and building a really simple GAE datastore-backed JSON API pulled in from the static files. Nothing complex but I want it to perform as well as possible. If GAE would work just as well, I'm thinking I should just keep everything there. Do the front-end cache servers prevent unnecessary hits on the app server instances?