Which OS do you use? Which would you install for a new user?Which for your workplace?

[X11]

OS's I use: OzOS, Xubuntu, XP
OS's I use for servers: Ubuntu
OS's I install for a new user: PC-BSD, OzOS
OS I use at the workplace: OzOS
OS I use at a School: OSX

OS I am testing soon: Omega 10

OS's I have used/tested: Too many to list! 1000+ Linux/BSD/Solaris/Haiku

[Jake]

OS I mainly use: Fedora
OS's I use for servers (vary's depending on circumstances): RHEL, CentOS, uBuntu Server Edition, FreeBSD, OpenBSD, Fedora 9.
OS I install for a new user: Fedora
OS I use for working: Fedora
OS For school: no school.
OS I am testing: Fedora 11.