The importance of selling your vision writes:

A team aligned behind a vision will move mountains. Sell them on your roadmap and don’t compromise — care about the details, the fit and finish. Only work with those that have (as Larry Page puts it) “a healthy disregard for the impossible,” and push everyone on your team until it’s uncomfortable.

Kevin Rose writes about how he failed at selling his vision. Digg almost failed, and is still not as big as it once was.