ThinkGeek :: Keychain GPS Receiver with Bluetooth
Okay, none of my computers have Bluetooth. My old Nokia phone doesn't have Bluetooth. And yet, I'm still contemplating picking up one of these GPS keychains for the day I eventually get a phone or PDA that actually has Bluetooth.
You say "compulsive shopping," I say "economic stimulus package." ;)
Actually, I do have this sort of half-baked idea in my head of using one of the various Net/mini/MacStumbler programs with a GPS and getting the data together in some sort of Google Map Mashup-- but it's not like it's a really fantastic idea or I don't have better ways to spend my time and energy.