I thought you might be interested in my little project. It’s located at http://coinmap.org/
It’s a map showing places where Bitcoin is accepted. All you have to do is to add payment:bitcoin=yes tag to your venue in OpenStreetMap. Venues are added automatically (database is updated every 15 minutes). The map also tries to determine the type of the venue from OSM tags and assign the correct icon.
For more information about Bitcoin see Wikipedia: http://en.wikipedia.org/wiki/Bitcoin