GPS

NMEA data
http://www.gpsinformation.org/dale/nmea.htm

HOWTO: Track your position using a GPS dongle and Google Earth
http://ubuntuforums.org/showthread.php?t=1083710

Using A Bluetooth GPS From Python
http://www.robertprice.co.uk/robblog/archive/2007/1/Using_A_Bluetooth_GPS_From_Python.shtml