Would you rent your car to a stranger? A new popular trend is peer-to-peer car sharing services. They allow you to rent your car out to strangers and defray your ownership costs. These services are already being offered in New York, California's Bay Area, Portland, Oregon and Austin, Texas, and you have the final say of who gets to rent. Neil St. Clair of New York rents out his BMW 5 at $75 a day and made $700 last month!