Google App Engine community support is moving to Stack Overflow
groups.google.com
groups.google.com
The move is meant to move those(the majority) who would rather send an email off rather than do their own research, or read the docs, to a more appropriate forum.
And google employees can beef up their SO reps for answering the same questions over and over again. There's no incentive in answering most of those kinds of questions on a mailing list. And email is easy to ignore.
https://groups.google.com/forum/?fromgroups#!searchin/google...
https://groups.google.com/d/topic/google-plus-developers/JBF...
I've been listening to Joel Spolsky and Jeff Atwood's podcasts and frankly, they are the best podcast I've ever listened to. Insightful, funny, creative, enlightening. I've burned the mp3's to CD's for easy listening in the car. All programmers should listen to all of these.
I catch their podcast via the IT Conversations aggregator: http://itc.conversationsnetwork.org/
Very worth listening (and easy to subscribe)
If not, Google should reconsider. A lot of people got screwed when StackExchange dropped support for custom "stack exchanges" a few years ago.
That's why they enforce people to incubate a topic site and only allow it to go through if it's substantial enough.
If you want to have your own SE-like site, you may want to look into AskBot - it's very good.
Recently, the Ubuntu community took down a lot of wiki pages that had howtos for ancient versions of the OS.