I've thought for a while about a service that would allow you to define a set of basic models/domains, including basic validation rules and relationships on them, then offer to generate the CRUD code, but in a variety of frameworks - grails, zendframework, rails, asp.net, django, etc. Beyond being a 'neat idea' though, I couldn't find any real use case for it.
Yeah... the people who can make use of this sort of thing already would probably be able to do the steps of generating the code in the RAD framework so I just don't think there's much room to actually make money on something like this but maybe if integrated with something like Heroku it could have potential.
