Put that empty hot shoe to work with the just-announced Jobo photoGPS, a $159 Global Positioning System (GPS) receiver that is triggered by the hot shoe contact on your camera. The "device allows automatic geo-tagging by capturing raw GPS data and time which enables new and more efficient ways to search, visualize, and share photo collections," reports PCPhoto.
Jobo is launching the product with Windows software to sync data with your images, but a Mac OS X version is promised by the end of the year. If it turns out to be reasonably easy to use, this could be a good geo-tagging solution all levels of photographers. It might even be a nice solution for my Canon G9.