Finding out which repository the package comes from

x61:~% apt-cache policy scratchbox2
scratchbox2:
  Installed: 1.99.0.24-1
  Candidate: 1.99.0.24-1
  Version table:
 *** 1.99.0.24-1 0
		500 http://ftp.nl.debian.org unstable/main Packages
		100 /var/lib/dpkg/status