The problem is the price, though. Spinning up a couple EC2 micro instances to run your app is $0.02/hr per instance and you can run a few threads per instance.

The problem is the price, though. Spinning up a couple EC2 micro instances to run your app is $0.02/hr per instance and you can run a few threads per instance. Appengine is $0.04/hr (double that soon), with one thread per instance.