Google App Engine

Google has launched App Engine, a developer tool that enables you to run your web applications on Google's infrastructure. The goal is to make it easy to get started with a new web app, and then make it easy to scale when that app reaches the point where it's receiving significant traffic and has millions of users. Google App Engine gives you access to the same building blocks that Google uses for its own applications, making it easier to build an application that runs reliably, even under heavy load and with large amounts of data. Google App Engine packages these building blocks and takes care of the infrastructure stack, leaving you more time to focus on writing code and improving your application.
http://googleappengine.blogspot.com/2008/04/introducing-google-app-engine-our-new.html

http://www.techcrunch.com/2008/04/07/google-jumps-head-first-into-web-services-with-google-app-engine/