StackMob provides a hosted platform for creating server-side data stores, logic, API's for mobile apps. They were nice enough to send me a beta invite, but I'v

StackMob provides a hosted platform for creating server-side data stores, logic, API's for mobile apps. They were nice enough to send me a beta invite, but I've only had time to take a cursory glance. At present, the functionality looks equivalent to what you can do yourself using Ruby on Rails scaffolding to generate data models with a XML/JSON REST API--with the addition of an easy-to-use UI to manage that, rather than the raw command line interface of Rails.