GPS and Photography

I've been looking for a decent way to geo-locate my photos for a little while. A clip-on unit for my 400D would be perfect, although the firmware doesn't support such a thing (apparently Nikons do?)

The Sony CS1 GPS seems okay, but the performance looks a little poor (low power consumption, but older GPS tech). It also seems a bit naff, and frankly overpriced.

Today I checked back with the excellent guys at SparkFun and found this new GPS logger.
Nice stuff too. Battery life could be better at only 7.5 hours of full on logging, but it is a nice small unit with an excellent GPS chipset (SiRF III), built in charger, choose-your-own-storage and enough reconfigurability to stretch the battery life when you want to.

Iz wan dis too.