I appreciate to announce the map-project to locate bitcoin businesses most effectively is....
coinmap.org(
dedicated Thread on bitcointalk)
There are several other sites doing something similar, but with own submit forms they cannot keep up.
Perhaps driven by the up and down of the markets, but this map scales up and up again.
I encourage you to use and propagate this wonderful website.
If you know a real world place to pay with bitcoin that you cannot find there, just tag it on the free maps of the world:
http://openstreetmap.org/ and do not forget this tag: