More fun with Googlemaps
Now you can track routes you might walk/run/bike with this Gmap Pedometer tool and it will give you your mileage. (Thanks Jake)
This really comes in handy because I have been doing a decent amount of bike riding lately and am never quite sure how much mileage I have put in. Although, I did find that a ride I was particularly proud of was about half the number of miles I thought it was (I blame mapquest). Oh well, better luck next time.