kjetil@kjetil:~$ sudo apt-get check
[sudo] password for kjetil: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Then, the output of apt-cache policy:
 kjetil@kjetil:~$ sudo apt-cache policy
Package files:
 100 /var/lib/dpkg/status
     release a=now
 650 
http://dl.google.com/linux/deb/ testing/non-free amd64 Packages
     release o=Google, Inc.,a=testing,n=testing,l=Google,c=non-free
     origin 
dl.google.com 500 
http://ftp.cl.debian.org/debian/ unstable/non-free Translation-en
 500 
http://ftp.cl.debian.org/debian/ unstable/main Translation-en
 500 
http://ftp.cl.debian.org/debian/ unstable/contrib Translation-en
 600 
http://ftp.cl.debian.org/debian/ unstable/non-free amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=non-free
     origin 
ftp.cl.debian.org
 600 
http://ftp.cl.debian.org/debian/ unstable/contrib amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=contrib
     origin 
ftp.cl.debian.org
 600 
http://ftp.cl.debian.org/debian/ unstable/main amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=main
     origin 
ftp.cl.debian.org
 650 
http://www.debian-multimedia.org/ testing/non-free amd64 Packages
     release v=None,o=Unofficial Multimedia Packages,a=testing,n=wheezy,l=Unofficial Multimedia Packages,c=non-free
     origin 
www.debian-multimedia.org 650 
http://www.debian-multimedia.org/ testing/main amd64 Packages
     release v=None,o=Unofficial Multimedia Packages,a=testing,n=wheezy,l=Unofficial Multimedia Packages,c=main
     origin 
www.debian-multimedia.org 650 
http://security.debian.org/ wheezy/updates/non-free amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian-Security,c=non-free
     origin 
security.debian.org 650 
http://security.debian.org/ wheezy/updates/contrib amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian-Security,c=contrib
     origin 
security.debian.org 650 
http://security.debian.org/ wheezy/updates/main amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian-Security,c=main
     origin 
security.debian.org 550 
http://ftp.cl.debian.org/debian/ squeeze/non-free amd64 Packages
     release v=6.0.4,o=Debian,a=stable,n=squeeze,l=Debian,c=non-free
     origin 
ftp.cl.debian.org 550 
http://ftp.cl.debian.org/debian/ squeeze/contrib amd64 Packages
     release v=6.0.4,o=Debian,a=stable,n=squeeze,l=Debian,c=contrib
     origin 
ftp.cl.debian.org 550 
http://ftp.cl.debian.org/debian/ squeeze/main amd64 Packages
     release v=6.0.4,o=Debian,a=stable,n=squeeze,l=Debian,c=main
     origin 
ftp.cl.debian.org 500 
http://ftp.cl.debian.org/debian/ wheezy/non-free Translation-en
 500 
http://ftp.cl.debian.org/debian/ wheezy/main Translation-en
 500 
http://ftp.cl.debian.org/debian/ wheezy/contrib Translation-en
 650 
http://ftp.cl.debian.org/debian/ wheezy/non-free amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian,c=non-free
     origin 
ftp.cl.debian.org 650 
http://ftp.cl.debian.org/debian/ wheezy/contrib amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian,c=contrib
     origin 
ftp.cl.debian.org 650 
http://ftp.cl.debian.org/debian/ wheezy/main amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian,c=main
     origin 
ftp.cl.debian.orgPinned packages:
Kjetil