I noticed that the http://kdenlive.org/download-debian page says to use an outdated link for installing kdenlive.
According to http://deb-multimedia.org, the sources.list references have changed:
10/05/2012 :
New domain name deb-multimedia.org
You must edit your /etc/apt/sources.list to replaces the old repository name by the new one.

Could someone with editing permissions update this?

I could make this edit but I am not sure what to make it say exactly.

Should the text>:

Under root account, add the following lines to /etc/apt/sources.list:

deb http://www.debian-multimedia.org sid main
deb http://www.debian-multimedia.org testing main

Install Debian-multimedia GPG key:
apt-get update ; apt-get install debian-multimedia-keyring

become (3 changes)>

Under root account, add the following lines to /etc/apt/sources.list:

deb http://deb-multimedia.org sid main
deb http://deb-multimedia.org testing main

Install Debian-multimedia GPG key:
apt-get update ; apt-get install deb-multimedia-keyring