There’s an interesting new Google Maps Mashup called Walk Score that looks at how far it is from any given address to key services like a grocery store, drugstore, schools, parks, etc. and computes a walkability score.
Mine was 95 out of 100 :-)
Note that the site has had some problems with heavy traffic (Google limits how many visitors per day on their free maps). It’s up as I write. If it’s not when you check, try the next morning.