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I think I saw that one. A few days ago I saw a video by Fat Cow, and everytime he went into Cat Form, he looked like a Worg. Was that an item or addon?

Here it is: http://www.warcraftmovies.com/movieview.php?id=43538

You can switch models all you want as long as it's just for yourself. I've fiddled around with this a bit - changing the model of my Warlock's Voidwalker to an Earth Elemental, etc. It's not hard to do (at least it wasn't when I tried it, pre-BC), and all you need is a .MPQ packer/unpacker file (winMPQ is the one I used).

I love this video. The timing is beautiful, the pvp is just fun to watch. Whatever guild made this is awesome.

They fixed it. It allowed characters to hack into the game and, say, change the fence in AB to a lower fence that you can jump over. It's considered hacking and blizz doesn't like it, so they fixed it. I used to mess around with it 'cause it was fun (turned my voidwalker into ragnaros and changed lots of weapon looks). Client side only hacks are still hacks, though. sad I'm sure they don't care about the model switching for cosmetic reasons but you can do some really twisted things with it.