As part of preparing for the upcoming trip to Fairbanks, Alaska and Barrow, Alaska, I've been researching tools to allow me to geotag / geocode photographs. With the advent of Google(tm) Maps, Google(tm) Earth, and other tools / sites, there's a lot of interest in coding photographs with the latitude, longitude, and altitude (LLA) of the position at which the photograph was taken.
Flickr is one of the better (and more popular) sites that support georeferencing of photographs. Here's a great reference of tools available to support Yahoo!'s flickr service:
Quick Online Tips: The Great Flickr Tools Collection