My little Social Media 'spy' application http://spy.appspot.com makes "15 Useful Google App Engine Applications" on LouisGray.com written by Mike Fruchter! I just slid in there at 15... hoping to keep plugging along adding useful features and using 'spy' to expose more and more folks to the value of Social Media.
Google App Engine really does make it possible to kick out an idea out into the world delivering scalability, quality and efficiency right out of the gate. I hope developers continue to discover it's power, Python and Django are nothing to be afraid of in fact I really value learning them.
Thanks again to Mike and Louis!