We've seen an iOS device used to control a soda machine before, but here's a setup with a more, ahem, practical application for New Year's Eve: a beer cannon controlled by an iPhone. You can see a video of it in action after the break, and the creator even has it set up to post videos of fired beer cans straight to Twitter. The whole thing is controlled using what looks like a web app on the iPhone (or it might just be a normal app fitted with some web views), and allows you to select what kind of beer you'd like, as well as look through the cannon's web cam, and then shoot your be
