If you want to have linux software for your computer. They're better than window, in my opinion especially when comes to web developing, web designing, etc.http://www.ubuntu.com/
You can download free software, or request cds from them and they will ship it to you at no charge. I have 10 softwares from them, good ones.
If you want a server linux, then - http://www.ubuntu.com/products/WhatIsUb ... veredition
If you want a linux desktop edition, then - http://www.ubuntu.com/products/WhatIsUb ... topedition
One more good linux operation brand - http://www.kubuntu.org/
Free request cds, free softwares download as well.
Beware, please read the instruction/guide on that site so you won't mess up your computer. There's no way to turn back to window, unless restore. Or unless if you have a 2nd harddrive then you can use a switcher to go back to window/linux.