Grasshopper Tutorial PDF's

Get Started here:

http://download.mcneel.com/s3/mcneel/grasshopper/1.0/docs/en/AlgorithmicModelling.pdf
(Algorithmic Modeling, Mohamad Khabazi)

http://www.liftarchitects.com/storage/research/Grasshopper%20Primer_Second%20Edition_090323.pdf
(Grasshopper Primer, Andrew Payne)

http://wooj.files.wordpress.com/2009/05/grasshopper-tutorial-woojsung-com.pdf
(Rhino Grasshopper Tutorial, Woo Jae)

get started with grasshopper

http://www.grasshopper3d.com/
(main grasshopper page)