Kevin Quiggle and Mike Whitton at Linux.com - A geo-located photo album in five easy pieces:

"Open standards, and openness in general, enables people to combine a variety of technologies in new and interesting ways. For example, using a camera with Exif support, a GPS receiver, the Google Maps API, and Perl, PHP and JavaScript, Mike Whitton created a Web-based photo album in which the photographs are automatically placed on a map at the exact location they were taken. Let's take a look at how this is done."