I haven't figured out how to do it yet, but you can map out routes with Google Maps. I posted a 'cue sheet' for my commute on my blog, and a regular visitor was kind enough to render it at http://www.gmap-pedometer.com/?r=163806 (and no, it's not door to door... pretty much starts at the first major turn, so my many fans and the paparazzi won't discover it and be hurtling themselves at my screen door like so many frenzied moths...)