The host xbian.brantje.com has been replaced with apt.xbian.org… so if you get the following error:
Err http://xbian.brantje.com stable/main Translation-en Something wicked happened resolving 'xbian.brantje.com:http' (-5 - No address associated with hostname)
You need to edit /etc/apt/sources.lst so that it looks like this:
deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi deb mirror://apt.xbian.org/mirror.txt stable main
Also see the FAQ at http://www.xbian.org/faq/.