Tridge grabbed my google maps based GPS stuff
and has improved it greatly
adding a lot more client side java script. He's setup a bzr
repository for the code at http://gps.ozlabs.org/ (google API key is for gps.ozlabs.org only).
Anyway, I found a line drawing package
for java script so I've added some graphing abilities to his stuff. My first play with java script and bzr. You can pull from my tree at http://gps.ozlabs.org/mikey/. I've also setup a test page for my stuff here