Listen to what problems people have. I had lunch with a friend today that has a niche need. He owns a 2 truck garbage truck company. He has a few hundred customers, and he wanted some way to document the route. He tried using Google maps but it didn't work easily enough, the industry specific software that is already out there is sized for 50 truck fleets not 2 truck fleets, etc.

If anyone has already built that app, please let me know.