If you don’t like EC2 you have an option to move your app to a new vendor. But if you don’t like GAE  (Google app engine) there aren’t any solutions which can replace GAE easily. AppScale might change that. AppScale is an open-source implementation of the Google AppEngine (GAE) cloud computing interface from the RACELab [...]

Most web applications needs at least the following services to be self sufficient. Computational power, storage, webserver/cdn, database,  messaging, loadbalancer and monitoring. Here is the tried and tested steps as recommended by AWS folks Move static web content to S3 storage first. Images, css stylesheets, javascript files, html, etc can all be moved to S3. [...]