Random instructions for help:
This 'debian' directory is used by dpkg-buildpackage when creating a .deb.
You'll need to install :
   apt-get install dpkg-dev quilt debhelper
Then from within the trunk directory (or whatever forms the root of the 
postfixadmin project), do the following :
1. Update debian/changelog; include your email address in the last change 
                (this is used to determine a gpg key to use)
2. debian/rules prep
3. dpkg-buildpackage -rfakeroot 
4. Look in ../ at the shiny .deb / .tar.gz
5. Profit.