Ever consider tearing up your driveway and replacing it with a "Greener" choice? I do every day I drive into mine. Perhaps you live in cold wintry climate or dry hot climate. Here's a few ideas which predominantly suggest examine your driving behavior and parking needs, then lead to material selection.
One thing to consider regardless of the material you choose is assess how much parking lot area you truly need. I bought a house in Vermont with my wife with a very wide and lengthy driveway which when the kids grow up I'd love to make smaller.