Google recently sent out favorite places window decals with unique QR Codes to 100,000 businesses and I commented on the Favorite Places advertising video at the time.
What if the two came together? Businesses could for example paste an alternative QR Code over the QR Code on their decal. They might do this because they would rather point to a page on their website with more information or features than available on Google’s Favorite Places. The page on their website could still have a link to their Google entry for the reviews and coupons but would have additional information as well.
They may also perceive an advantage in that using Google Analytics on their website will enable them to have some idea of the success or otherwise in the placement of their decal.
For example the QR Code in the image below resolves to a mobilized version of this page via a redirect for Google Analytics stats but it could of course point to anywhere.