Ok.. I'll post the links to the finished materials here. Thats materials that have tutorials or descriptions written for them and finished projects. That doesn't preclude you from continuing to post in thes threads, or even spinning off a new version of the material, It just means they are considered finished experiments.
Macro Skin Material - Colin Freeman
Lava Skin - Anders Avero
Demon Skin - Colin Freeman
How to Use Porcelain Materials
Paving Stones - Marcel Bricman
Plastics - John Ashton-Keller
Hardwood Floor - Marcel Bricman
Some Metals - John Ashton-Keller and Paul Forwood
Concrete - Kyle Maguire
Lacy Cloth - William Young
Frosted Glass - John Ashton-Keller
"Bad" Banana - William Young
Grimes, Tarnished Metals, Concrete, etc - Anders Averö
Irridescent Multipass Material - John Keates
Multipass skin Shader - John Keates
Wood Material - Vern Zehr