Google I/O 2008: Best Practices - Building a Production Quality Application on Google App Engine
Once an app is out of development and has thousands or millions of users, a developer needs to worry about pushing buggy code in front of users. This talk will walk through some of the facilities that Google App Engine provides for testing code in the production environment before seamlessly pushing it live to your users. Additionally, we'll discuss some tips for optimizing the performance of your app so you can give your users an even better experience.
Ken Ashcraft (Google)