One of these days I will see an a detailed comparison of some of these Java cloud options (from GAE, to Heroku, Amazon Beanstalk, Cloudbees, and now Jelastic).

Given that I want to launch a side project on the cloud, this is very relevant to me, but I don't have the time to try all of them.

Interestingly, seems like they are building a platform similar to CloudFoundry and OpenStack.