Great idea... but do you have confidence that Uber/Lyft/Sidecar are happy to be aggregated like this?
We would be happy to take any of those providers down from our listing if they reach out to us. As we perceive it, if they chose to be removed, they provide an advantage to their competitors. We're listing them as benefit to our user base, but in doing so, we send over free traffic.
First of all, I love your idea.. wanted to do the same thing. I showed this to the product team @ lyft just FYI, not sure if they see this is a violation of their terms/data or not. We will find out tho.. love the idea. Uber may charge a booking fee.. would be nice if they would share that with you as a lead.. Will be watching your progress, please update twitter/facebook as you go..