I'm not a total devotee of Extreme Programming, but it does have a lot of good ideas, chief among them being doing frequent releases from the very start, and co

I'm not a total devotee of Extreme Programming, but it does have a lot of good ideas, chief among them being doing frequent releases from the very start, and constantly getting feedback from the customer. In a context where your customer is the general public, it's fairly obvious how to adapt that development model. Anything from a limited closed beta to a simple public release might be appropriate, but ideally you want to develop in a way such that you have a minimally functional but stable app fairly quickly, and add features and refactor (hopefully based on user feedback) from there.