Online marketplaces where you rent out things you own have become booming businesses. You can rent out your home with AirBnb, Roomorama, Wimdu and BedyCasa, or your car with Buzzcar, Getawround and RelayRides, or even random stuff lying around with SnapGoods, Rentoid and Parking Panda.

But how about making money off of renting out yourself, cashing in on your own spare time by doing odd jobs?

Leah Busque is the founder of TaskRabbit, a service that does just that. It's an online portal that links thousands of people to clients who need an extra pair of hands for errands and chores, a little extra time to wait in line, or even a stranger's gumption to help pull off the perfect prank.