If your going to try one out for the first time.... don't make the mistake i did and go with Mandrake... I was able to get it up and running fine from the live cd... and then able to install it from the live cd to a second drive...and easily get it to dual boot with windows (little help from G2G on that)
but.....
when i went to locate some of the FREE Software everyone raves about i entered the realm of NIGHTMARES on how to install it. It was very buggy (as someone here at G2G told me

) One piece of software required another pice just to startup, then another piece to display, and another piece for the gui... and so on...
It was never ending and it was to be figured out using the Evil black box and a whole slew of commands that I had never heard of
I finally got sick of it, uninstalled it and found the one im using right now... THIS ONE I WOULD RECCOMEND TO ALL NEW LINUX USERS WHO ARE USED TO WINDOWS... here is why:
If you want to avoid the evil black box this one has a user interface similar to XP (not really though either)
If you want thousands upon thousand of different free software that is installed with the click of a button
If you want all your software dependency problems solved for you (again avoiding the evil black box)
If you want the versatility to do dang near anything as far as modifying how your desktop, panels, themes, icons, cursors, look and react (again all for free - no stardock fees)
If you want to be able to do anything you want with the software (no worries about illegal hacking, keygens, cracks, or any of that garbage). <-- pretty much true for all versions i think... im going on my 4th day with it now.
I would reccomend............................. Ubuntu ........................ I love it and I will never return to windows, except to play my PC games. PS..... It's also rated Number 1 right now by Distrowatch
The most uptodate distro (and the one i used) can be found below, along with instruction on how to burn an ISO and then a link to thier forums for help.
http://www.ubuntu.com/download