For the last couple of months I have been playing with a variety of Linux distros, but, they are running on a USB memory stick. I found a nice program UNETBOOTIN that allows me to download and then install on the memory stick a number of Linux distros. You have the option of having the progam download the ISO itself or you can point it to the ISO image on your machine. The program does everything else for you and at the end you have a bootable Linux.
I find this tool to be extremely useful as I can quickly test out a new distro and not waste CDs if the distro does not meet my needs. I have two sticks right now with Linux. The first stick for now is SABAYON and the 2nd will be for a security and recovery distro. I need the second stick as friends and neighbors have problems with viruses, trojans and spyware getting on their machines and I figure a secure Linux distro that can help me clean this up will be very useful.