Google App Engine is a new fully-integrated development environment, which offers you to run your web applications inside the Google infrastructure, which means you have their software framework, processing and storage power to work with. In this preview release you can sign-up for a free account with 500MB of persistent storage and enough bandwidth and CPU for 5 million monthly page views. For now you are limited to python-based web applications, but they promise to support more languages in the future.
