We talked a little about OpenStreetMap, or OSM, a few weeks ago after Groundspeak made the decision to switch their geocaching.com online mapping service from Google Maps to OSM as a result of Google deciding to charge host sites for the use of their mapping services. This has sparked a lot of new interest in OSM, especially from the geocaching community, as to how to edit OSM maps, and how to load OSM maps onto GPS receivers.
I ran across this great post yesterday from the GeoGearHeads. It includes links to some very helpful information and tutorials on these topics, as well as a great, approximately 15-minute podcast, about OSM. Following is one of the OpenStreetMap for Beginners tutorials to get you started:
OpenStreetMap for Beginners Part 1: Add points of interest from David Ellams on Vimeo.