For my first project on the Google App Engine, I decided to create an API for NextMuni.com data. Parts of the code was based on Mihasya's work on YourMuni, http://yourmuni.appspot.com. Beautiful Soup was used to get data from NextMuni and they are cached for 60 days using memcache.
The Url for the app is http://apimuni.appspot.com/. If any of you guys have any suggestions, leave them in the comments. I plan on exposing as much NextMuni data as I can (and as allowed).
My experience on GAE was great. The tutorials on their site were very helpful. Deployment was brainless. I only needed to run a command on the prompt and my code was off to Production.