I have a distance goal for the year and want to keep track. Also, my wife -- who apparently loves me -- got me a Garmin Edge 205 for our anniversary. For those who don't know, it is totally based on GPS (i.e., calculates speed without a sensor on the bike) and it maps every ride you do. I can also download others' rides and have it guide me places I've never been. Mostly unnecessary, but it is a very cool gadget. Of course, this also let's my wife keep very close tabs on my whereabouts.