According to a recent patent filing, Google is planning an expansion into the physical advertising space. Specifically, they are planning to start advertising on billboards which would be connected to the internet! The patent is based on the interactive connection (because google isn't going to make boring billboards). Engadget notes, "The system apparently works by only advertising products that are available and in stock within stores in the local area. Stores will be able to buy advertising on these local electronic billboards through a similar system to how AdSense currently works: by logging into a computer and buying them." Nice!