Heroku
Heroku recently announced a public beta. Heroku is a Rails hosting service with a twist: They offer a fully integrated development and hosting environment. You develop your application using a web based IDE, and it gets automatically deployed to Amazon EC2. The IDE works surprisingly well. You get a typical file browser that allows you to create new files / folders or open, rename, move, or delete existing files /folders. The actual editor performs syntax highlighting and automatic indentation, but does not seem to offer any other convenience features (like auto completion or snippets)....