Some useful Python packages and links.
Tutorials
Enthought Python binary for various platforms
Practical Python for Astronomers
Python Tutorials
Astronomy scripts
Astrolib
Python Quick Reference sheet
SciPy Cookbook
Matplotlib Thumbail gallery
Potentially useful Packages (not all tested)
MCMC (EMCEE)
Pyevolve - Genetic Algorithm
AstroML: Machine Learning and data Mining for astronomy
Fisher Matrices (Dan Coe)
Trilogy to create color images from fits (Dan Coe)
Scientific Python (not SciPy)
VPython for 3D graphs