An Online Physics Textbook!

It claims to be a work in progress, but it seems pretty complete to me. You can find it here at http://physics.info/

PyCUDA Documentation

Here is the PyCUDA documentation.

Maxima

Maxima is a free computer algebra system developed at MIT. Here is a great tutorial to get you up and running.

L-System Fractals in Python using PIL

Here is some code from ActiveState detailing some L-System fractal stuff

Pretty neat site on fractals

Go here.

A good source for the Python Imaging Library

I've run across this site multiple times, but I don't think I've ever posted it here. Anyway, it has lots of stuff about the PIL module.

Python Sorting

So... sort() sorts an interable in place, whereas sorted() returns a sorted copy. This also works on an iterable of objects! So, here's the run-down.