From the publisher
“Google App Engine makes it easy to create a web application that can serve millions of people as easily as serving hundreds, with minimal up-front investment. With Programming Google App Engine, Google engineer Dan Sanderson provides practical guidance for designing and developing your application on Google’s vast infrastructure, using App Engine’s scalable services and simple development model.”
Our one-paragraph review
This book serves as a solid and thorough introduction to the powerful but increasingly complex App Engine platform from Google. If you want to come up to speed on App Engine, this is the one book for you. There's another book from O'Reilly called Using App Engine - skip that one. It is “App Engine for Poets.”