webapp, tipfy or django on google app engine
I'm still investigating, but I think webapp and tipfy will be a lighter framework than django.  Right now, I am using just webapp and the cold start times are already too long. I want to use tipfy for sessions and keep everything else in webapp.
What are you trying to optimize for?  Speed of development? Easy of programming? Obscure middleware?
which one are you using on google app engine?
what were the reasons behind your decision?