imgoingthereanyway.com

If you're planning a trip from, say, Austin to Houston, would you take $25 to drop a box of books off in Tomball (it's along the way)? I would. Would you take, say, $50 to bring an extra person? I might. And I figure I'm not the only one. The rest almost writes itself.

If you've got a thing that needs to get from point A to point B, you tell the site. If you're taking a trip, you tell the site where you're going. It tells you who or what needs to take the same trip.

Obviously, it's more complicated than that. How do you confirm delivery? How do you make sure your passenger isn't an axe murderer? How do you deal with paths that are inexact matches; i.e., Georgetown to Humble? What if you could get $200 by stopping in Giddings, but that means you have to go from Austin to Houston on 290 instead of 71/I-10 so you can stop in Giddings and collect $200. There are lots of details to iron out, and opportunities for extension. That's what makes it potentially valuable. I'm not going to build it, but maybe you can.