We found the following perfect match(es):
Ubuntu
Homepage:
http://www.ubuntulinux.org/
Screenshots: Click to view screenshots of this distribution
Ubuntu is a free, open source operating system that starts with the breadth of Debian and adds regular releases (every six months), a clear focus on the user and usability (it should "Just Work", TM) and a commitment to security updates with 18 months of support for every release. Ubuntu ships with the latest Gnome release as well as a selection of server and desktop software that makes for a comfortable desktop experience off a single installation CD.
(This distribution also has a "Live CD" you can use to test the distribution before you install it)
Kubuntu
Homepage:
http://www.kubuntu.org/
Screenshots: Click to view screenshots of this distribution
Kubuntu is a user friendly operating system based on KDE, the K Desktop Environment. With a predictable 6 month release cycle and part of the Ubuntu project, Kubuntu is the GNU/Linux distribution for everyone.
(This distribution also has a "Live CD" you can use to test the distribution before you install it)
Debian
Homepage:
http://www.debian.org/
Screenshots: Click to view screenshots of this distribution
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian GNU/Linux provides more than a pure OS: it comes with over 15490 packages, precompiled software bundled up in a nice format for easy installation on your machine.