If I'm not mistaken, JC's PHP page is JCDex for threads.
I've been developing a PHP based site that uses my UBB's member base for authentication. It isn't quite ready for public release, as it still has a number of bugs and quirks. It uses content islands, the PHP login code I posted, UBBnews.php which I posted, and a few other things that I custom wrote for my site.
As of right now, it seems the best way to do a portal for UBB.classic is to write something in Perl or PHP custom or you could try the ubb_portal.pl that was written. If you are looking for some of the features of PHPNuke or PostNuke, you might want to consider developing your own or hacking the portal software which is a challenge
