This is unrelated to my Python experiments, but I thought this site is useful enough to plug. I'd noticed incompetech.com before when I was running the week long MAGIC contest, as it's got a great selection of royalty free music. But I only just noticed today it's also got a great section of downloadable graph paper. I was only after the square kind to plot out some image algorithms, but this site seems to have any kind of printable paper I could possibly need - square, hex, diamond, perspective, polar, music staves and more. And you can customise the PDF algorithm for your needs if you want large or small grids. Really spiffy.

This site might be useful to anyone who is working on sketching out some ideas for 2D games. The square and hex paper would be pretty useful for mapping in strategy games, and the diamond paper is useful for isometric work. Could be handy to bookmark!