I love GPS.
If you've got Google Earth installed click here to view a couple of trial runs.
Those paths – tracks in GPS lingo – are admittedly pretty boring. I just turned on the GPS while I drove to work, Agilent, to my apartment etc. But they're still pretty damn cool. 🙂 The colour indicates the speed I was travelling at (in mph). If you open the "legend" folder in Google Earth you can see roughly what colour corresponds to what speed.
GPS Visualizer also allows you to colourize your tracks in other ways, like alititude , bearing and slope and there are heaps of other options to tweak the the output. Cool application. Looking forward to taking it to Yosemite and skiing where I'll have some interesting tracks!
Matt hearts GPS
And to pre-empt the jokes, yes, I only bought this so Melissa can keep track of where I am. 😉