Proletariat's beverage director Chris mentions in an interview on Thrillist NY "instead of doing a printed menu, and printing a new menu basically every day, we decided to do a QR code that you can scan with your phone that will take you to an online version." Here you can see Proletariat's page on BeerMenus they link to from a QR code.
With BeerMenus customers scan a QR code to see your beer menu on their phone and thumb through your list of beers and read a description of each beer that you currently have. No need to update your print menu and no need to waste paper.
Here's another example at Pizzeria Paradiso in DC
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