I have a little program called Trackme http://forum.xda-developers.com/showthread.php?t=340667 running on my HTC TYTN II PDA Cell phone with Windows Mobile 6. The HTC TYTN II has a built-in GPS (Global Positioning System). Trackme has the possibility to send the coordinates to your own webserver if you have PHP running. As you all know I have no PHP running and don't want to either, So I made a little ASP webserver program which stores the coordinates in a MYsql database. Google Maps has an excellent API interface On this picture below I select the last record from the database and plot it as an marker on the map.
Click on the marker and you see from what time I'm at that place.
Soon I will be putting complet routes online as well. Also it's now possible to create some events on my Home automation system. Like if I'm in the neighborhood put on the heating system or lights or whatever a Geek can think of [;)]

Soon it will be possible to log other user in my database as well.
If you have windows mobile on your PDA Cell Phone and a GPS, Trackme will run and the possibility is there!
Pieter Knuvers
www.bwired.nl Online House in the netherlands. Domotica, Home Automation.