alum:~# apt-cache policy iceweasel; apt-cache policy firefox
iceweasel:
  Installed: 2.0.0.13-0etch1
  Candidate: 2.0.0.13-0etch1
  Version table:
 *** 2.0.0.13-0etch1 0
        100 /var/lib/dpkg/status
     2.0.0.12-1 0
        500 http://ftp.no.debian.org lenny/main Packages
     2.0.0.6-0etch1+lenny1 0
        500 http://security.debian.org lenny/updates/main Packages
firefox:
  Installed: (none)
  Candidate: 2.0.0.6-0etch1+lenny1
  Version table:
     2.0.0.6-0etch1+lenny1 0
        500 http://security.debian.org lenny/updates/main Packages