Lenticular printing has been around for a while. But in the last few years it has seen a revival among the cartographers at Urban Mapping. You can go here to read more about how the printing technique is used in multiplying the communicative real estate on a single piece of printed material. If you'd like to see a video of this stuff in action then click here. You can also get your hands on your very own specimen here, though only NYC and Chicago versions are available.