WoW movie making on Macs is fairly different.
The video capture is native to the WoW UI, 3rd party programs exist but aren't as good as fraps or much used.
I doubt you'll ever see a PC user publishing a movie made with iMovie, Final Cut Express or Final Cut Pro, the main 3 Mac movie editing softwares.
When a n00b Mac user comes to your movie making forum, he'll instantly see that this is a 99% PC user place = no reason to stick around because the vast majority of information won't apply to him.
And as long as I'm suggesting things, it'd be great to be able to search for movies and moviemakers using particular programs or hardware, but that's a bit of a big suggestion. I'd rather start off small, with a little Mac Movies forum.