Room or Ride Share Tools for Drupal Camps

I am wondering if anyone is aware of any third party tools or simple suggestions for organizing a ride/room share board for our Drupal Camp.

We are not using COD for the camp and do NOT want to add this feature to our camp site at this time (maybe next year). I'm trying to figure out if a google doc is the best solution or if there might be a third party site that would provide this functionality for specific events/conferences.

If I don't find a third party site, I will probably set up a Google Doc and suggest that people post their Drupal User names to get in touch with one another.

Any creative ideas or tool suggestions?