Free software
Nick persuaded me to install Debian on this iBook, so I wiped out MacOS completely, and now it's Debian all the way. I've never installed Debian onto a non-Intel machine, but I was surprised at how straightforward it was. The AirPort card and the sound card are supported; XFree86 runs (at only 800x600, alas), and I've got OpenSSH, sniffers, Mozilla, gcc, and all sorts of other good stuff -- probably comparable to what I'd have under MacOS X, but here I can apt-get source anything which strikes my fancy.
Having an iBook running Debian impresses people, somehow; they see it as incongruous, and they see it as hard-core. Some people are disturbed by it. Others didn't know it was possible.
Because Debian is a complete Operating System, the installation procedure may seem a bit unusual.(debian/README.html)