I'd reccommend searching Google (or yahoo) for Perl Content Management System (or Perl CMS).
For note, don't use PHPNuke, its a resource drain compaired to PostNuke.
PrimeTime: if you were using say UBB.Threads you could customize a MySQL/PHP (php can be replaced with whatever web language you wish so long as you know the mysql calls) and customize a CMS to use the member system.
