This thread on Blender artists has some interesting node set ups using pynodes, most notably (for me) the halftone one, since I've been trying to get something like this for ages!
http://blenderartists.org/forum/showthread.php?t=125741&page=6
this is the blender pynodes cookbook.
http://wiki.blender.org/index.php/Resources/PyNode_Cookbook
some notes on writing renderman shaders
http://accad.osu.edu/~smay/RManNotes/WritingShaders/surf1.html
more renderman shader writing links
http://www.fundza.com/
someday I'll have a look through this and try to write my own but for now I'll just post it here! I need to finish a few projects first before I can start in on node experiments with a proper project! argh! Maybe I can se them for a game or something? GLSL shaders in real time? hmm.....
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