I think the upgrade disabled all locally defined sites and they have to be re-enabled with 'a2ensite'. Apache upgrades are always a pain, but this one was particularly piss poor.
See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717476 message #38 for more on the subject of sites being disabled. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org