The question is, once you have this idea, is this enough? Is it something people would actually switch just to have?

The instant they say something you don't expect or already know, you should drop into detective mode.

Given the huge number Xbox owners and how many of them love gaming spectatorship, its a natural fit to bring the Twitch experience to the 360.

Sales is this cure all for this problem. Get people to give you their credit card and I guarantee you they're actually interested.

You want to learn about what's already in their heads. You want to avoid putting things there.

Most startups are not just built for the person who is using them. When you do that, every now and then you get really lucky and... are representative of some huge class of people who all want the same thing you do... but very often that just turns into a side project that doesn't go anywhere.

The one question you can't ask is, "Is this feature actually good or not?"