"Demos are an art form. They blend mathematics, programming skill, and creativity into something incredible to watch and listen to."

With this said, I would like to introduce to those who aren't familiar with the Demoscene community, 3 of the most popular demos existing:

1. fr-025 - the popular demo (9 MB) by farb-rausch - Music
2. VIP2 (7 MB) by Popsy Team
3. Zoom3 (64 KB) by AND

While not glancing with galore DirectX 9 features at all they are fascinating to watch and make appetite for more. I especially like Zoom3, where the creator squeezed so much into a small file.

If anyone knows other demos who are better in his/her opinion please let me know, can't have enough of them! :-)

Links:
http://www.ojuice.net
http://www.demoscene.ru
http://www.scene.org
http://www.pouet.net