Ubuntu Linux has been proved to be the ultimate operating system. 
It’s free, simple, easy to use, free of viruses, can’t be hacked (literally), uses least resources, great graphic user interface…
The list is long and i would ultimately run out of words.
Read below to know how to get the cd delivered free to your home anywhere in the world.
Ubuntu has proven itself everytime it was put to test, like in the CanSecWest. Where after a long grueling battle which claim a MacBook Air and a Vista machine, the only machine that remained unharmed was the one running Ubuntu! Now if that doesn’t speak volumes of the OS’s security I don’t that will. (Read more at slashdot)
The latest version Ubuntu 9.04 is up and out for download.
Ubuntu has been shipped all around the world absolutely free, and may be this is the reason for its increased popularity. Ubuntu gets its financial support from Canonical, and shipit is used to send the cd’s al across over the world for free.
Ubuntu has been released in many versions as well, like Kubuntu & Edubuntu.
More about all the versions-
Ubuntu
Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need – a web browser, presentation, document and spreadsheet software, instant messaging and much more.
ShipIt
Edubuntu..
Scholars and Education oriented Ubuntu….
The Edubuntu community is built on the ideas enshrined in the Edubuntu Manifesto: that software should be available free of charge, that software tools should be usable by people in their local language and despite any disabilities, and that people should have the freedom to customise and alter their software in whatever way they see fit.
get it’s cd’s from here………..
Shipit
Kubuntu..
Kubuntu is a user friendly operating system based on KDE, the K Desktop Environment. With a predictable 6 month 
release cycle and part of the Ubuntu project, Kubuntu is the GNU/Linux distribution for everyone.Get its free cds here…Shipit-kubuntu