Everyone should scroll down the page on that COLOURlovers page and look at the photos of the new South African bills. They're beautiful. That's the kind of timeless design and typography I keep hoping for.
I agree that the U.S. needs to introduce more colors to their paper money (I believe they should change the lengths too, to aid the blind in differentiating between bills), but my god that's an ugly $5 bill. Come on Dubya, take a weekend photoshop course and design us something nice!
http://www.youtube.com/watch?v=ObijckNVzio