Beer statistics

I was at the grocery store looking at an aisle full of beers from all over the world. And I needed to pick one. I thought it would be cool if they had an electronic display (next to aisle or at various locations similar to the Price checker) to show which beer sold the most (this year, this month, all time etc. like Youtube does). The display would be touch screen based that can be expanded to see additional information. I can then try out the top 10 sellers and end up with the one that I prefer. You can replace the beer example with any other product and see how it would be really helpful. When are we going to get Web 2.0 in the real world?