iOS: Older cameras still take great pictures, but they're missing newer features like GPS tagging. If you want to add that in, Cult of Mac shows how to do it using an iPhone, the camera connections kit, and some software on your Mac.
Cult of Mac uses GeoTagr and the camera connection kit to add the GPS data, but can also augment that with a GARMIN and GPSBabel as well. The end result is a pretty simple system that adds GPS data to all your photos, regardless of what kind of camera you're taking them with. Head over to Cult of Mac for the full guide.
Add GPS to your dumb camera using your iOS device [Cult of Mac]