If you've not checked out Radiopops yet, go sign up now. Its a beta/prototype by the BBC radio labs team. It also shows the type of thing we are thinking and building inside the BBC but can't really make public easily. This is mainly a technical issue about platforms and scaling but I think its better that its made clear this is a prototype that have it hanging around the BBC for years because its not build with the house technologies not the most handy for the job.