Apparently, “walkshed’ refers to the number of businesses within walking distance of your home, set by Alan Durning in the blog Daily Score to be one mile:

To get the a fairly complete count of businesses, go to this Qwest online phone directory, select the business listings, type “all” in the category field, click “near a street address,” type in your address, and choose “1 mile.” (Sorry, Canadians, I have yet to find a .ca that performs this trick.) If you’re lucky and the database gods are smiling on you (the site is temperamental), Qwest will promptly reveal how many businesses there are within a one-mile walk of your front door. Call this your Walkshed Index, your Burley Score.

For me, it’s 113. I bet that number will grow very quickly.

(via Blog Town, PDX)