Did you ever wonder how your favourite new Linux distribution looks like? Now how can you try it without installing it and ruining your current OS? All current Linux distributions allow you to boot it without installing it so that you can see how it looks and feels. I'm going to show you how you can try the new Kubuntu 10.04 LTS.
First, you have to download the ISO image from here: http://releases.ubuntu.com/kubuntu/lucid/kubuntu-10.04-desktop-i386.iso
Once downloaded you are going to use UNetbootin, which allows you to create a bootable Live USB drive (type "sudo apt-get install unetbootin" if it's not installed). Then type unetbootin to start UNetbootin.
Once the copying is done leave the USB drive plugged in and reboot. At the BIOS you might have to select to boot from the USB drive.