I spent a better part of Thursday doing a fresh install of Debian GNU/Linux along with MailScanner, SpamAssassin, ClamAV and Baruwa web interface for MailScanner. I also have MailWatch 1.0.5 setup and installed side-by-side with Baruwa.
Below is the web interface to MailScanner (http://www.baruwa.org/) which allows for adding Users and Domains.
Postfix version 2.7.1-1+squeeze1
MailScanner version 4.83.5
Baruwa version 1.1.0
ClamAV 0.97.1/13296/Thu Jul 7 22:28:42 2011
SpamAssassin version 3.3.1
I used quite a bit of information from http://www.spamtips.org/ to help with configuration/update/architecture of the antispam server.