Proposal: App Stores
The proposed site might also allow for marketing questions as these are often considered by developers when coming to a new market, and there is curently no better place than here for such questions.
I'm thinking about questions like "On Android ad support is popular for free apps. If I port on Samsung Bada, should I keep the same business model or rather release a paid app?". Such questions are specific to app stores and not tied to a specific technology or OS, and I feel they would fit in nicely in this proposal.