Get your free copy of Ubuntu 9.04 today! Ubuntu is a free, open-source operating system based on GNU/Linux. When you download and burn Ubuntu to a CD, you can try it without making any changes to your computer. It comes with everything you need to get work done.
Why try it? It is faster than your Windows or Apple operating system, for one thing. It is more secure, for another. Ubuntu can do all kinds of neat tricks, like run from a flash drive so you can take your computer with you (without taking the hardware with you). And if you have an old computer sitting around that cannot run Windows without wheezing, try Ubuntu.
Ubuntu also stars in its own comic book, Ubunchu.
I have been using Ubuntu as my primary operating system at work for more than two years, and I have no plans to go back to Windows. Once you go free, it is hard to go back.