How to Think Like a Computer Scientist (openbookproject.net)

Learn Python from the beginning.

It is well worth the effort. A designer or 'business guy' who can code has much higher credibility.

It's a good introduction to Python for those who cannot yet program. I recommend it to the economists who want to use my Python experimental economics user interface library, and they usually like it.

This is the successor:

http://www.greenteapress.com/thinkpython/thinkpython.html

Downing has a bunch of good stuff; his text on concurrency is good too.

Check this out too

http://wiki.python.org/moin/BeginnersGuide/NonProgrammers