You've heard of Airbnb? The website that launched in 2008 lets people rent out their house, spare bedroom or even the living room sofa to travelers for a few nights, taking 3 percent from every completed booking. (They also protect hosts with a $1 million property damage guarantee.)
But did you know you can also rent out your parking space using Airbnb or ParkatmyHouse? Both services offer free listings and are popular in areas near stadiums, concert halls and airports.