Some neighborhood friends and I have taken to borrowing. I don't mean clothes, sugar, or books (although that happens too)...but we actually borrow each other's homes. One friend has a basement exercise set-up with the treadmill I'd otherwise wait for (and pay for) at a gym. Another friend lives without cable and comes to my place for some occasional guilty television indulgence.
Other friends borrow some of my home's space: I house one person's bicycle in winter months, and a set of drums year round for another pal who can't store or practice in his apartment. There are endless ways to borrow and loan space or amenities, and we love that it saves everyone money and promotes good will.
Of course the biggest way of loaning a home is to let someone stay with you -- whether in-between apartments, in-between moves, in a time of need, or visiting from out of town. But the daily small loans and gestures are the easiest ways to share and really make use of what you've got.
Photo: How Stuff Works (Health)