I give my colleague Charles Golvin credit for finding this article on the official Google blog. I'll be working on a report on the intersection of social and mobile in early 2010 so please send me more examples if you have some. I'm especially interested in the role of social/mobile in the Retail environment.
Google is mailing out storefront window stickers to 100,000 local businesses in the US. (see their blog post for complete information). If you have the right type of phone and supporting software, you can take a photo of the code on the sticker (see below) and you'll be taken to that business' PlacePage on the Web. The service will show available coupons, allow for ratings, get reviews, etc.
Here is their post on the applications that work with the service:
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