CouchSurfing.com

looks like an interesting idea - "CouchSurfing.com helps you make connections worldwide. You can use the network to meet people and then go and surf other members' couches! When you surf a couch, you are a guest at someone's house. They will provide you with some sort of accommodation, a penthouse apartment or maybe a back yard to pitch your tent in. Stays can be as short as a cup of coffee, a night or two, or even a few months or more. When you offer your couch, you have complete control of who visits. The possibilities are endless and completely up to you."