One thing. Really well.
Here's one thing that I was reminded of today. You don't have a product until you can do one thing really well for a set of people. And you do it so well that they fall in love with it and they can't use anything else.
So if you have a product and it can do one thing really well for a certain set of people and it does it so well that they love this thing and they can't go anywhere else. Yep, then you have something.