apt-cache policy
Package Files:

 100 /var/lib/dpkg/status
     release a=now
 500 http://security.debian.org sarge/updates/non-free Packages
     release v=3.1,o=Debian,a=oldstable,l=Debian-Security,c=updates/non-free
     origin security.debian.org
 500 http://security.debian.org sarge/updates/contrib Packages
     release v=3.1,o=Debian,a=oldstable,l=Debian-Security,c=updates/contrib
     origin security.debian.org
 500 http://security.debian.org sarge/updates/main Packages
     release v=3.1,o=Debian,a=oldstable,l=Debian-Security,c=updates/main
     origin security.debian.org
 500 ftp://ftp.us.debian.org sarge/non-free Packages
     release v=3.1r6,o=Debian,a=oldstable,l=Debian,c=non-free
     origin ftp.us.debian.org
 500 ftp://ftp.us.debian.org sarge/contrib Packages
     release v=3.1r6,o=Debian,a=oldstable,l=Debian,c=contrib
     origin ftp.us.debian.org
 500 ftp://ftp.us.debian.org sarge/main Packages
     release v=3.1r6,o=Debian,a=oldstable,l=Debian,c=main
     origin ftp.us.debian.org
Pinned Packages:

apt-get dist-upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded