I've been tracking myself (or more accurately: my phone) with Google Latitude for a little over a year now. During that time I've been in (or at least passed through) six countries on four continents, traveling some 76,000 miles. Not bad. Here are the actual data points for August 2010 through August 2011 mapped out:
Now I wish I had figured out this geo-tracking thing earlier. When I have spare time, I'll try to import previous years based on geo-tagged photos.