Palomar came up with an interesting concept for deploying city maps. We all know how difficult it is to unfold and later fold a (city) map correctly. The solution of palomar for this: just crumple the map!

http://www.palomarweb.com/web/index.php?option=com_content&view=article&id=72&Itemid=27

I wonder what geodata they use and if they would make an OpenStreetMap version available.