Ubuntu

If you haven't heard of Ubuntu, it is one of the more popular versions of Linux.  If you want to try Linux but you are having a tough time trying to burn the iso images required to make a bootable disk, you can just visit www.ubuntu.com and request a FREE disk. It's a great operating system, I use it all of the time.  I actually have one of my laptops setup to dual boot with Windows 7 and Ubuntu.