I find OSM a very interesting project. I have been using openmoko neo freerunner as my GPS since summer 2008. You can reach me via timo.lindfors@iki.fi or lindi-@IRCNet/freenode/oftc (note the dash). Lately I have been experimenting with RTK (real time kinematics) to get cm-accurate traces with cheap GPS devices. See http://lists.osgeo.org/pipermail/foss-gps/2010-August/000407.html for more information.