Sony now sell a GPS addon that can be used with there dSLRs and other new and high spec Cameras in there range. The GPS is £99, and can be used on a fair few other makers cameras, as said, some Nikon dSLRs.
Its called the GPS-CS1, pretty nice looking, can be used with there Cameras and Camcorders that support GPS.
I am pretty sure the Sony GPS thing can be used with any Camera more or less, you'll have to check it out though
Ricoh Cameras are pretty good, that Camera is a tad on the steep side for what it is though, but on the other hand, its rugadised (if thats a word) and weather sealed so i guess its a nice bit of kit...