Navigation Groups and Forums
Bimmerboard Navigation Forum - http://www.bimmerboard.com/forums/bmwnav/
BMWNavigation Forum - http://www.bmwnavigation.com/
OpenBMW Forum - http://www.openbmw.org/
Yahoo BMW Nav Forum - http://autos.groups.yahoo.com/group/bmwnav/
Yahoo I-Bus Forum - http://autos.groups.yahoo.com/group/HackTheIBus/
Yahoo OpenBMW Forum - http://autos.groups.yahoo.com/group/openbmw/