Ime not 100% sure but I dont think there is any way to do that because of Microsoft. But there could be some way to do it, Ime sure there is some one working on away to do this.
No, you can not use MSN Messenger for the Mac with iChat. I am assuming Microsoft will eventually add this option in the future but for now you should use Skype. Great program, audio, and video...PLUS, it is 100% free!
I believe that iChat only does Mac, AIM, and Jabber. For almost everything else you can use Adium.
I personally use iChat for my @mac.com as I can only do video/audio with other iChat users through it (or can I now also do AV with AIM Windows friends?).
For my MSN, Yahoo, AIM, and ICQ I use Adium. Adium does more than just those, but that's all I use. http://www.adiumx.com/
For MSN it really depends on what you want to do. If you just want to chat with your MSN buddies, get Adium. It works great. If you want Video chat, then aMSN. It does Video chat on MSN.
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