XBMC - Media Center

XBMC is an award-winning free and open source (GPL) software media player and entertainment hub for digital media. XBMC is available for Linux, OSX, Windows, and the original Xbox
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HOW-TO install XBMC for Linux on Ubuntu 10.04 lucid

Appliciation > Accessories > Terminal:

$ sudo add-apt-repository ppa:team-xbmc
$ sudo apt-get update
$ sudo apt-get install xbmc
$ sudo apt-get update
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or
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$ sudo gedit /etc/apt/sources.list

# XBMC
deb http://ppa.launchpad.net/team-xbmc/ppa/ubuntu lucid main
deb-src http://ppa.launchpad.net/team-xbmc/ppa/ubuntu lucid main

$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0x6d975c4791e7ee5e

$ sudo apt-get update

$ sudo apt-get install xbmc xbmc-standalone
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web:

http://xbmc.org

http://wiki.xbmc.org/index.php?title=HOW-TO_install_XBMC_for_Linux_on_Ubuntu,_a_Step-by-Step_Guide