Your ideas

But here's one I'll sell you for $1,000,000.

Electronic keys in your cell phone. What if you could get into your house and start your car with electronic keys in your cell phone? Lexus already has electronic keys. It's a short step to bring your phone in when you're buying a new car and have the car company program your key into it. And just make it so that you can't lock your doors without taking your phone out of the car.