Stop sketching and start building.
I keep a notebook in my pocket, and I write down all the stuff we could ever do with Foursquare.
Do what you love and the rest will come.
I used to snowboard 30 days a year. Now its down to eight.
Building a product is easy. But building the company that builds the product is hard.
If there's something you want to build, but the tech isn't there yet, just find the closest possible way to make it happen.