I can’t test this, but J√∂rn-H. has made a sort of widget called GE-Remote that takes the input from a GPS unit and uses it to steer Google Earth in real time. As he succinctly puts it, “With a mobile internet connection (GPRS, UMTS or WirelessAccessPoint) you have a moving map now.”

Again, perfect for flying SAS to New York, except that now the process appears to have been idiot-proofed.

(Via this Google Earth Hacks thread.)