Linux gaming with Steam
I don't know if steam is officially launched for Linux but i can say that some user would like steam on the linux desktop , for : playing games like Half life , portal,team fortes etc....
Now i don't use Linux any more, Because of the Non gaming ..
But when this is out or are stable I would consider a switch ....
now games like Warcraft or call of duty are not yet on Linux distros but, I think they will follow shortly.
Linux is that other option when you don't want to buy windows or mac and it runs great with most of the app's installed (funny I should mention apps , because it is more like mac and the interface is like mac )
now you get to interfaces KDE or Gnome
I use KDE but the Gnome are also nice.
Try Linux for yourself @ www.ubuntu.com/
www.linuxmint.com
fedoraproject.org
www.opensuse.org
note all of the top are different linux distro's and It is your choice what you try :)