Online books for learning Python and why this is relevant

Why Python is still relevant, I am reviewing options for studying python, going to provide these links for my friends: But thought I'd post this, have been amazed by how much python has grown in the last three years, really has hit a critical mass.

Google App Engine

Google App Engine lets you run your web applications on Google's infrastructure. [...] App Engine provides a runtime environment that uses the Python programming language.

python Graphic User Interface FAQ

What platform-independent GUI toolkits exist for Python?
Depending on what platform(s) you are aiming at, there are several.

How to Think Like a Computer Scientist: Learning with Python

The goal of this book is to teach you to think like a computer scientist. This
way of thinking combines some of the best features of mathematics, engineering,
and natural science. Like mathematicians, computer scientists use formal languages
to denote ideas (specifically computations). Like engineers, they design
things, assembling components into systems and evaluating tradeoffs among alternatives.
Like scientists, they observe the behavior of complex systems, form
hypotheses, and test predictions.

Dive Into Python Python from novice to pro

Dive Into Python is a Python book for experienced programmers. You can buy a printed copy, read it online, or download it in a variety of formats. It is also available in multiple languages.

OPNET

OPNET uses python for scripting and filters in the ITguru and ACE Analyst programs for network traffic analysis.
ACE™ Analyst and IT Guru Systems Planner™