Ubuntu

Ubuntu is the child of Mark Shuttleworth, millionaire and founder of Canonical. (Oh, and he's been in space and spent 8 days on the ISS.) It's a relatively new distro and has become very popular as it is as easy to maintain as Debian, but far more frequently updated than Debian Stable.

LUG has an Ubuntu mirror at: http://lug.mtu.edu/ubuntu/

Install/Live CD mirror at: http://lug.mtu.edu/iso/ubuntu/

The latest stable version is: Maverick Meerkat

The current development version is: Natty Narwhal

Add Mirror

For Desktop Edition:

Go to System->Administration->Update Manager
Click Settings (lower left corner)
Click Ubuntu Software tab
For Download from: select Other
Click on United States
Scroll down and select lug.mtu.edu (it's in alphabetical order)
Click Choose Server
Click Close
Click Reload

In Command Line (useful for server edition):

Open up /etc/apt/sources.list as sudo
Replace all instances of "http://us.archive.ubuntu.com/ubuntu/ with "http://lug.mtu.edu/ubuntu/" (example would be in vi/vim, use command ":%s/us.archive.ubuntu.com/lug.mtu.edu/g"
Save file
run apt-get update

Features

Debian based
6 month release cycle, which is timed shortly after and includes the latest Gnome release
Easy to install/use
Strong user community
Philosophy of, "If it doesn't work on install, file a bug report about it."
X.org
Uses Gnome, but has been forked to use KDE in the Kubuntu project
The Edubuntu project is based on Ubuntu.