Carpooling

AlterNetRides - Free service nationwide that matches up commuters. Includes links to other resources.
AlterNetRides.com

Carpool Crew - Includes search by radio station and interests to match up commuters with similar interests.
www.carpoolcrew.com/

Carpoolconnect.com - A commuters search engine. Enter a zip or postal code and find commuters in your area searching for you to share a ride.
www.carpoolconnect.com

CarPoolWorld - Matches commuters based on proximity to home and work. Worldwide.
www.carpoolworld.com/

Compartir - Carpooling via a geographic search engine. Enter your requirements.
www.compartir.org/

Drive2Day - Cost free carpooling service which offers carpools world wide. Search for drivers or passengers.
www.drive2day.com/

eRideShare - Ride sharing and carpool board. Travel and commuting databases arranged by country and state.
www.erideshare.com/

Freewheelers - Lift sharing database connects drivers and passengers to share the cost of travel to work, festivals, gigs and sporting events.
www.freewheelers.co.uk

GishiGo - Matches travelers for one-time trips.
www.gishigo.com/

Lift Share - The online journey matching service that finds you travelling companions.
www.liftshare.org/

Ridester - Feedback-rated system for one-time travel.
www.ridester.com/