I would consider being a host, but I'm always concerned possessions may get stolen having stranger in my apt. I'm surprised this doesn't turn away a lot of potential hosts.
Still a fantastic idea, and would definitely look to be a guest when traveling on a budget.
Do graphic designers hang out @ Hacker News? I think developers would find more responses if they branched out to sites that graphic designers frequent.
http://www.amazon.com/Tibetan-Book-Living-Dying-Internationa...