Update: The quotas have been reset, the site is back up, and engineers at Google are monitoring them and working closely with me until we can figure out what the issue is and fix it.
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Getting domains (both www, and naked domains) setup properly on Google App Engine is not a straightforward affair; it has several gotchas. This quick guide summarizes the process I use with the following four actors: Enom (domain registrar), DynDNS (DNS provider), Google Apps (domain management and other apps for your domain), and Google App Engine (your actual app).

Get the necessary accounts

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Backing up and restoring the datastore in your local SDK can be very useful for several use cases. Personally, I find that I alternate between running the local SDK with a restore of data from the deployment environment and with an empty or test datastore.

The local SDK slows down painfully when you populate it with real amounts of data so sometimes I test with an empty datastore while developing. Restoring data, however, takes a long time too so I don't want to run my restore process all the time. And I don't have to, since I can simply backup the local datastore and restore is by copying it back.

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Finally! :) Go get 'em!

According to this thread on the Google App Engine forums, it appears that Google App Engine has become unreachable for some Chinese developers as of two days ago, with more developers reporting that their apps have become affected today.

Damien Hou, author of three Google App Engine apps stated that one of his apps has 360,000 users and that as of this morning his apps were unreachable. (more...)