python tutorial:
http://docs.python.org/tutorial/
numpy tutorial [arrays]:
http://www.scipy.org/Tentative_NumPy_Tutorial
plotting tutorial:
http://matplotlib.sourceforge.net/users/pyplot_tutorial.html
free online books:
http://diveintopython.org/toc/index.html
http://www.ibiblio.org/swaroopch/byteofpython/read/
install enthought python:
http://www.enthought.com/products/edudownload.php
video tut:
http://www.youtube.com/watch?v=YW8jtSOTRAU&feature=channel