Parkatmyhouse.com

We've never found ourselves with an excess of driveway space, but if that changes any time in the near future, there's a chance the vacant asphalt could make us a buck or two. Parkatmyhouse.com allows users to upload photos of their driveways, garages or yards and then rent the space for parking on a monthly basis. The program is just getting underway here in the U.S., though UK drivers have been using the site for some time now. Across the pond, parking via the site can cost anywhere from $10 to $30 per day, and the service's organizers say Parkatmyhouse.com has earned users more than $5 million.

Currently, the service is looking to get off of the ground in New York City, Boston and Washington, D.C., so if you have space and are willing to put up with someone's vehicle in your way day in and day out, head over to the site and sign up. It may just pay for your new garage in no time.