Google's AppEngine launch had a lot of us squealing about lock in but Portland-based developer Chris Anderson seems to have proved us wrong. He's launched App.com, which enables AppEngine applications to be run on Amazon's rival web services platform.
It makes no claim to be a finished product, it's a proof-of-concept. On his blog, he says:
Host your App Engine applications on my new site, AppDrop.com, it's lotsa fun, and pretty much works. I didn't build it to scale, or for extra security - but it is open source, so if you are up for it, there are links to the GitHub projects from the App Drop homepage. It should be relatively straightforward to build your own App Engine host.
A good report at Waxy.org has links to "Anderson's Fug This application running on Google App Engine and the identical code running on EC2 at AppDrop".
Another effort is the Google App Engine Elastic Server (beta).
