Glad to see I inspired a few people You can multibox 2 accounts on the same account without any major difficulty. The problem is simultaneous input. It isn't easy to do without 3rd party software to send commands to both WoWs. Plus you still have some latency to deal with as you switch from window to window (higher end hardware should eliminate that though).

I would poke around for one and run both WoWs in a window. I can't make any promises Bliz will not get upset at you - they tend to frown on those things but in general I don't think they will care too much if all it does is send keystrokes. Just watch out for keyloggers and the like.