It's Demo's like this that remind how much I love coding and inspire me to update my skills.
That demo is one of many entries in the Nvidia 8800 based NVScene 2008.
Whatever hardware you have, PC, Amiga, Atari-ST, Commodore 64 etc' (what? no Mac?), there will be something here to blow your socks off!
More Demo sites here, here and here, Enjoy!