Get started with Google App Engine

Google App Engine allows you to deploy apps in Google's production infrastructure (for free upto a limit and then using pay-as-you-go model). Key advantages include:

• You don't need to worry about handling scaling (delivery on a global scale and low latency), so you can concentrate on app's features and innovations
• OpenSocial, Android devices, Facebook, etc. opens up your app to 100s of millions of target users
• Typical to Google solutions, costs are low and fair

Get started with App Engine with Rick Hightower's three-part article series:
Google App Engine for Java: Part 1: Rev it up!
Google App Engine for Java: Part 2: Building the killer app
Google App Engine for Java: Part 3: Persistence and relationships
Ofcourse, you could also start here: http://code.google.com/appengine/