Ikea's messed around with augmented reality before, but this year they've really outdone themselves. With just a phone and a copy of the catalog, you can now call up a digital version of any piece of furniture and put it anywhere in your home.
All you have to do is throw the catalog on the floor to set an anchor for the illusion and you're all set. Granted, from an AR standpoint, this is nothing new, but it's still cool. And more importantly, it could actually be useful. Looking at a 3D rendering through your phone isn't quite the same as seeing the real thing, but it's as close as you could hope to come without holograms.