We run mapping parties which are events where anyone can come along, we lend a GPS and show you how to go out and do some mapping and get the data in to openstreetmap. We have one coming up in Denver 19/20 July. They are informal events with no explicit time commitment and often a social element / beer afterward.
Click the link for more details.
OpenStreetMap creates and provides free geographic data such as street maps to anyone who wants them. The project was started because most maps you think of as free actually have legal or technical restrictions on their use, holding back people from using them in creative, productive, or unexpected ways.
Official Website: http://wiki.openstreetmap.org/index.php/Seattle
Added by williumbillium on July 9, 2008