I'm floored by Britain's new coinage, designed by Matthew Dent, a 26 year-old graphic design student. They're based on the British Royal Arms and all form a piece of the whole. For a little more explanation and some history, be sure to watch the video.
On the other hand, the MySpace-ification of U.S. money continues with the new five dollar bill. Technically impressive, completely uninspired and totally American.