hrm. the only shader/texturing books i can think of with a figure on the cover are maya-specific. no, wait, i saw a remaindered book at london drugs a couple of weeks ago ... ah, here it is: Inspired 3D Modeling & Texture Mapping. i don't recall anything about poser, but i didn't look that closely. the "bible" for procedural shaders is Texturing & Modeling: A Procedural Approach. i have the first edition of this, and it rocks. but yes, it is expensive.