Linux is an awesome (and usually free!) operating system.

 To find out which distribution is best for you, try out the  Linux Distribution Chooser

 Remember that just about every major distribution ("distro" or "flavor") of Linux has a support forum, so look there for any questions or problems you may encounter. 

Want to try out Linux without installing it?  Most distributions have what is called a "LiveCD" that you can boot from.  You just have to put the CD in, reboot, and make sure that your computer is configured to boot from the CD drive before the hard drive.

You can even have free Ubuntu or Kubuntu CDs shipped to you.  Currently, the CDs are the previous version that has long-term support, 6.06 LTS instead of the newest version: 6.10. 

Some Distributions: