If you use Google Latitude, you have always been able to see where’s you’ve been using the little known Google Latitude Dashboard found at:
It shows you where you’ve recently been, airplane trips (take offs and landings), time at work vs.home vs. out, and countries visited. You can even export the last 500 visits out to a KML file that can be used by Google Earth. The latest update to Google Maps for Android provides some of this information right on your Android smartphone.
The updated Google Maps app also lets you check-in at “Home” after setting your home location. You may want to check where Google thinks you’ve been. I’ve been using Latitude since it launched but have not defined my “home”. I also transition from working in an office to working at home recently and Google has interesting ideas about where my “work” place is.