The best linux distro for n00bs

What is the best linux distro for n00bs?

Well, I am not a Linux guru, but have played with it some. Many noobs like Knoppix because you can boot it from a CD on your otherwise Windows machine and play with all the Linux stuff without commiting to fully installing it, but you can install it if you wish.

The one that have been hearing about a lot lately is Ubuntu. Lots of good reviews. I would go that way first. You can also run it off a cd to play with it. There is also Kubunto which is Ubuntu except it has the KDE instead of Gnome. I prefer KDE myself.

I am running CentOS x86-64 as a file server in our office. Seems pretty solid.