I enjoy a good mashup, especially one that shows off the benefits to the environment. WalkScore.com can tell you the walkability of your address. In my case, it’s a 97 out of 100, a walker’s paradise. (Precisely why we chose our apartment.)
I can see an environmental firm sponsoring something like this at a show. Or even a local apartment finder service linking this to their site. Or a real estate agent in ped-friendly cities adding the score to tailor to more urban customers. Enjoy and share with me your score.