Bed & Breakfasts are cool if you and the honey are going on holiday, but did you also realize you can rent out your own place for money? Airbnb lets you calculate how much your extra room is worth to travelers.

But for most of you, you'll probably just use that feature once, then use the app to find places to stay when you're out of town. Or even in town! Nothing says adventure like renting out a room right down the street from that guy you always see at Safeway. [iTunes]