Yes, you've probably seen my hoodie with the Kill Bill parody, featuring Tux the Penguin. Tux is the mascot for Linux, a free source OS waging the good fight against the dictatorship of Microsoft (Kill Bill, geddit?)
Why a penguin as the icon of technological discontent?
Some people have told me they don't think a fat penguin really embodies the grace of Linux, which just tells me they have never seen a angry penguin charging at them in excess of 100mph. They'd be a lot more careful about what they say if they had.
~ Linus Torvalds
I really like 'em penguins. ;p