Four years ago:

Here’s the problem: I, like many people I know, drive too many places all alone in my car.  One person in a three ton metal vehicle that could easily transport five.  To move all of that mass around, with such unused, waste internal space, is an inefficient use of energy.

Here’s one solution: ad-hoc transportation.  Capitalizing on the triple convergence between location-aware devices (iPhone 2 on June 9th, anyone?), social networking (Facebook, Twitter, et al), and an absurd number of nearly empty cars on the road (suburban America), the goal should be to connect people with people who are pointed in the same destination.

It’s here, and it’s called SideCar. I’m very intrigued to see where this startup goes. Thanks Alex for the tip.