Yep - windows live search and google maps (for ppc) both take advantage of your GPS, if any, and can show you where you are, and track you as you do door to door driving. Neither is good without a co-pilot (ie, you need someone to watch the bugger as you drive!) and good data coverage along your route - but they are free and you don't need to download maps ahead of time, which works for me.
A car power adapter is almost manditory if you use these, btw.
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