How walkable is your neighborhood?

This is a nifty site called walkscore that scores your location on walkability, found it on Atrios via Yglesias. My mom's house is 55 out of 100; not sure how it scores that, but it sounds about right. It could be a lot worse (it's about a 20 minute walk from the light rail), but it could be a lot better (it's about a 20 minute walk to anything other else except other suburban houses.) You can also see how walkable other things are, such as The Space Needle. (It scores a 94.)