Not sure if anyone here knows about this site or not, but
http://www.gmap-pedometer.com/ is a great link for determining running/walking route distances. I use it often to find out how long my run (scratch that, walks) actually are.
I've been trying to get back into running, but am having major knee problems leftover from bone grafting a few years ago. Could be a ligament issue, or a torn muscle. I am starting running with 90s walk, 60s run intervals. I can make it to the third or fourth run leg before I get excruciating pain in my knee and can barely hobble home. :/ Working with two doctors with it, but I've been a little on too lazy the past few weeks with work, and haven't gotten out to try running again.