MacPerl is a perl port that runs on the Macintosh under MPW and as a standalone and can be found here: http://www.iis.ee.ethz.ch/~neeri/macintosh/perl.html
MacPerl is different from the MacOsx PerlLanguage. MacPerl (which operated on MacOsClassic) had to make do with a operating system that didn't have a CommandLineInterface. It made simple things (like redirecting the standard output to a file) more difficult. MacPython? had the same problem.
BbEdit overcame much of the shortcomings of MacPerl. It integrated tightly with MacPerl and allowed for the standard output to be directed to a new BbEdit document window.
MacOsx comes with PerlLanguage ready installed. This is not MacPerl, but the regular Unix-y Perl you know and love.
Steve Marsh (mailto:steve.marsh@iit.nrc.ca) has an adapted version of Wiki Wiki for the Macintosh. Contact him for code and info (web pages at: http://www.iit.nrc.ca/~steve/, and McWiki at http://ii6.ai.iit.nrc.ca/cgi-bin/wikinotif.acgi)