You've seen those commercials with Lindsay Wagner for Sleep Number Beds -- everything, these days seems to have a number. Well, here's another one.

The idea behind Walk Score is to calculate how walkable any given home is. So let's say you're considering moving to a particular home or apartment building. Enter the address and Walk Score will deliver the verdict, taking into account nearby stores, restaurants, parks, schools, and so on. The highest scores out of 100 are where you want to be if walking is an important consideration for you.

In our tests, Walk Score got the big picture right, but the details of the amenities were sometimes funky. And as they point out, certain things "are not part of our alogorithm." Things like how hilly it is and how pleasant it is or is not for a walk.

Still, with all the personal, social, and environmental benefits of walking, this is a welcome new website.