Google App Engine Roadmap

The Google AppEngine roadmap shows a lot of promise; it'll significantly increase the sophistication of the applications that can be delivered using AppEngine. It's still true that it's hard to justify building a real application in an environment you don't control and can't easily duplicate, but it's nice to see solution gaining maturity.

If Google offered an open-source production environment -- not necessarily anything on Google's scale, but something that someone could deploy to at least a single server, or possibly a cluster of their own, of reasonable production quality, that would reduce the lock-in to the point that someone could conceive of building their own applications on AppEngine.