We're into the end of September already. For your fall driving pleasure, Zipcar is giving away $75 in free driving credits for their cars. If you sign up at http://www.zipcar.com with code FALL2008, you'll get $75.00 in FREE DRIVING credit. I think There is a small membership fee, but you will still receive a substantial free driving credit. Zipcar is a car-sharing "co-operative" and it has cars available to rent in cities like Atlanta, Seattle, Boston, New York, Ann Arbor, Vancouver, Toronto, and Washington D.C.