Photography's essential use of GPS differs from the typical GPS application in one significant way: You don't need it to tell you where you are, only where you've been. Why does this distinction matter? Because the former requires far more real-time horsepower and precision than the latter does. For digital photography, that translates into the difference between bulky, expensive power-draining solutions or small-footprint, cheap, energy-efficient ones.
The first product available using NXP's SnapSpot swGPS technology--Jobo AG's PhotoGPS, a $149 add-on that fits into a camera's hotshoe--will ship this summer. I'm just hoping that the execution works as well as the theory sounds.