I'm lookin' 4 cute forum scripts

[Johann]

I am looking for cute (functional and visual) discussion forum for
www. I would like to display the tree with threads, sort by author,
date and search.

I am interested in Perl, PHP or Python scripts only.  I do not know
what to choose. I found e.g.
http://www.w-agora.net/current/index.php?site=demos but it cannot sort
by date, author etc. (I didn't check it carefully, but all examples
cannot)

Mabe someone coud recommend me something?

-- 
Johann