There are many variations of Linux which gives you the freedom to choose the one you like. Think of it as Windows with options. There's Ubuntu, Red Hat, Debian, etc...and now Linux Mint. I must say, Linux Mint is very nice! I downloaded a copy the past weekend and found it to be very easy to use and is 100% ready to go out of the box. No configurations, no downloading extra codecs to get DVD movies to play. MP3's work just fine. Bam! Done!
Hey, give it a try. It is free and it is very robust. I'm sticking with Ubuntu for now but Linux Mint is on my radar screen. Here's Mint's home page. http://www.linuxmint.com/