Blender 3D: Noob to Pro/Advanced Tutorials/Python Scripting/Scripts for modifying meshes

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(to be written)

Also see saltshaker a basic but functional python script for blender, page includes details of how it was made.

http://jmsoler.free.fr/didacticiel/blender/tutor/python_script01_en.htm is a good one for learning about mesh creation.