AppDrop with SimpleDB

It'd be interesting if AppDrop moved its persistence layer to SimpleDB. You could then get a good comparative benchmark of a single instance of AppDrop EC2/SimpleDB vs. running on the Google App Engine infrastructure. From there, you could work on the scaling story, either with transparent scaling, like Google seems to offer, or with user-controlled scaling (since AWS services aren't free, the latter might be less dangerous).

Not that AppDrop is necessarily the future of AWS apps any more than GAE is the future of cloud computing, but a common model for platform-on-cloud development that could be deployed in more than one infrastructure is appealing.