Ubuntu is a Linux distro (that's distribution to you, n00b) that is almost easy enough for none techs to run on their desktops, but it isn't quite there yet. That's not enough to stop plenty of people from downloading and installing this most excellent OS on their machines (and I count myself amongst that number).
What if you love OS X's looks, but don't like the closed nature of Apple's software (I'm looking at you, Mark Pilgrim)? Why not make Ubuntu look like OS X? Lauri Taimila has a guide that can get you started on that.