I like the idea, but people need to be careful.

There was the guy that posted to bike forums a couple years ago. Can't find his onscreen name right now (some thing with/on religion). But he called himself a preacher and has his own religious web-site:
http://www.pedalprayers.org/Churches/page02.html

After reading enough of his post and his webpage rants section (that page seems to be removed), it became clear that he was homeless and mostly was riding his bent around the country sleeping in churches and at places from a couple of the sites like warmshowers.org or Couchsurfing. He just printed out the info and would show up unannounced. His feedback and rants page, showed that he could turn quite belligerent if the host did not cater to his desires.

If he flatted on the road, he expected the motorist that stopped to help, would drive him to a bike shop, pay the repair bill and then put him up for the night.