I recently discovered an excellent piece of software called RoboGeo, which is used for geocoding photographs. RoboGeo can be downloaded from here.

To get the most out of this software, you need a GPS unit that is recording a tracklog whilst you are taking photographs. Once you get to your PC, you simply point RoboGeo at the folder containing your images, and either download the tracklog directly from your GPS or from a GPX file. Note, that when using Garmin GPS units, you need to download the active tracklog, and not a saved tracklog. Saving the tracklog removes the timestamps.

RoboGeo then compares the timestamp on the photo to the timestamp on the GPS tracklog, and works out where you were when the photo was taken.

Once you’ve geocoded your photographs, you can either generate a Google Map that shows where you travelled, and adds a flag for each image you took, or you can output to a Google Earth kml file, which does the same in the Google Earth client.

A couple of examples can be seen here (Google Maps) and here (Google Earth).

If you do a lot of traveling, and use a GPS, then this software is definitely worth a look, and at $39 its not going to break the bank.