I think this is one of the major points covered in the Lean startup. In essence, you start with your idea, and sometimes after you get customer feedback you le

I think this is one of the major points covered in the Lean startup. In essence, you start with your idea, and sometimes after you get customer feedback you learn that maybe one of your features should be your product. For example, @Flickr actually started that way. Flickr was at first a social gaming site, but when they implementing photosharing the demand for that feature was so overwhelming they made it their whole product. If you'd like to talk about your idea with me, feel free to email me, which is in my profile.