This is interesting, I was just discussing a similar idea with a friend only a month or so ago. Our "inspiration" was the Wikileaks ordeal, to see if there was a way to sort of crowd source web pages, similar to how bittorrents work. Could a site such as wikileaks eliminate the problem of finding supportive hosting if they could just have their user base host their app instead? It'd be a cloud app hosted by the crowd.

Its an interesting idea, but one that is full of complicated issues, as mentioned in other comments here. Either way, I'd love to see a project like this get some traction, even if it provides a somewhat limited platform for development.