Google has sent QR Code stickers to about 190,000 businesses across the US that have been tagged as a Favorite Place (they have a mobile version of their website). Favorite Places are the mobile equivalent of Place Pages (aka Google Places).

via http://www.netmagellan.com/google-placerank-in-the-wild-750.html

Yet another Google metric for local search (just in the US for now).  I anticipate that searches will become more localized in the future as many people are looking for local products and searches when they do a search online these days.