Adding a few more to the list. Mostly Poser 6 but should work in Poser 7.  Many should work in Poser 5.

Renderosity:

Black and White Rendering
Creating Foot Prints
P5 Blender Node Trick
P6 Fuzzy Materials
Adjusting Hue Inside Material Room
Creating Tears with Displacement Maps by Neftis

RDNA:

Math Floor function at CastlePoser - RDNA Discussion
Math Floor Function (Castle Poser Tutorial)
Alternate Diffuse and Specular Channels
Incredible! Realism tutorial with ApolloMax stuff by Olivier
Porcelain-like skin by bagginsbill
Vargas Shader by bagginsbill
P6 Node Setup for Scales
Matmatic Skin for Jessi
Matmatic Bricks
Matmatic Jessi Algorithmic Eye Makeup
Matmatic Plaid
Matmatic Tiny Fibers by bagginsbill
Matmatic gurus - graph your functions fast by bagginsbill
Matmatic Star Fields for Outer Space
Matmatic car paint by bagginsbill
Matmatic Rope Shader
Matmatic - Cartesian to Polar Coordinates - Material Room
Parmatic! Automatically Parameterize your Materials
Realistic Skin
Water Material
More on Water Material
Procedural Material - Gold Fish Scales
Matmatic Demo
Matmatic Demo - Mixing nodes tutorial script

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi