SirDice said:As far as I know there aren't any official live CDs or USB sticks. There is an option in the installer to go to the live CD but that's probably not what you are looking for. It's a pretty stripped down, console (text) only, type thing. Great for fixing problems but probably not so great to get a real feel for the OS.
I'd suggest installing something like Virtualbox on your Windows machine and installing PC-BSD to get your feet wet.