Lunix for a Noob

I don't know jack shit about Linux, but I want to try a live CD. What distro would you guys recommend that is available in live CD form for a total beginner? I've already tried Ubuntu and it wouldn't boot.

>>40 here
PS: Somewhat knowing your way around will also help pose constructive questions. You won't believe what difference it will make being able to ask "The kernel crashes when loading xxx module, the yyy log says AAA, zzz log says BBB and my config and specs follow: [...]" instead of "ZOMG MY LUNIX DON'T BOOT LOLOL FUCK LUNIX". For one you might actually get constructive replies.