I discovered TurnKey Linux while I was running around on the web, and found it quite interesting.
From the site:
TurnKey Linux is a new open source project that aims to develop high quality software appliances that are easy to use, easy to deploy, and free.
The appliances are based on Ubuntu 8.04.2 which is an LTS release, so updates are supported until sometime in 2011. They even provide a base setup of either plain JeOS or the the basic stack.
Looks pretty slick, and once I get my new server going (once I get a new computer that is) with the dual core and 4GB of RAM, I'll probably play with some of these.