OpenStreetMap is a fabulously ambitious project to map the world and provide it for free to everyone under Creative Commons and open source licences. This is especially important when you remember that sources like Google and Nokia maps are proprietary and have restrictive licenses which prevent unlimited use.
The astonishing thing is just how far they’ve got, from a cursory glance it looks as though most of the major parts of the world are already covered, and from the looks of it, they’re moving into Africa in a big way right now. Check out the wiki if you want to get involved in the process. This is exactly what the Internet does best, and it’s a superb example of real user generated content (as opposed to that fake stuff which companies encourage for their own profit).
OpenStreetMap is an editable map of the whole world, which is being built largely from scratch using GPS traces, and released with an open content license. The OpenStreetMap License allows free (or almost free) access to our map images and all of our underlying map data, and the project aims to promote new and interesting uses of this data.