Thoroughly admirable tech geek Tim Vidas has figured out a nifty way to map all of his photo shoots with the handily hackable Google Maps. If you have a high-end digital SLR such as the and a compatible GPS receiver, you can embed GPS data into the EXIF information stored in your photos. Vidas wrote a Perl script that lets Google Maps read that GPS information and map out where you took all of your photos. It's a handy tool if you loved a certain subject or angle and want to recapture it. That, and it's cool to see where you've gone with your camera.
Caution: This is strictly a pro-level project. Do not attempt unless you have a GPS-compatible high-end digital SLR camera and are at least somewhat familiar with Web development.