www.drivemates.com is coolest site I found for travelers in USA, it
helps travelers to find airport pickups and droppings .

You can search for travelers arriving/departing in the same time and
arrange for sharing rides.

It has carpooling option for within the City or from state to state, if
that was not enough it arranges for Events rides and accommodation for
travelers going to same events.

Check it out really cool, I have registered today and I started
communicating with travelers on the private message board 

Eli