Download Ubuntu: www.ubuntu.com
Skydomes on my personal site: robbief.com
Interfacelift Wallpapers: interfacelift.com/wallpaper
BZFlag (Phil's recommendation): bzflag.org
I should just mention, as I answered Phil's question about Teamspeak, but never actually explained what that is. It's a program that lets gamers talk back and forth live (like a party-line) using headsets or computer microphones.