Mac::Carbon is a Carbon/Mac OS X port of the Mac:: modules included with MacPerl. It's in development, but a lot of it works, and it is available, on the CPAN (soon) and on SourceForge.net (now).
http://sf.net/project/showfiles.php?group_id=7940&release_id=122065
To discuss Mac::Carbon, check out the macosx@perl mailing list.