I’m using a Garmin Forerunner 301 to keep track of my mileage. Although it is somewhat inaccurate between buildings, I wouldn’t want to miss it. The newer Forerunner 305 seems to be based on a new GPS chip set providing much better accuracy, but the problem was not large enough for me to make me buy one. If you are interested, I’ve written something about my experience with the Garmin here on 43things.

for the g-map pedometer…it rules for planning routes and showing off your runs too.

http://www.gmap-pedometer.com/?r=451438

that was mine today

You may also want to try http://www.mapmyrun.com