How loud is the whine on the new 2Ghz MacBook?

I have been seeing alot of posts about people complaing about the whining thier MacBook is making. I was wondering how loud it is, and if its really anything to be concerned about. My old iBook makes some noise, but its not anything that annoys me, and you can't even hear it if there is some other noise in the room (i.e. TV, music, etc.).
Also, people have been talking about mooing, what the heck is that?
Thanks!

Mine doesn't. When plugged in I get a very very faint buzz from the charging but it's not the CPU whine like the 15" MBPs have and it's about 10x fainter in volume at least. I've gotten very good at hearing the CPU whine and this isn't it (at least on mine).
My black macbook whines too when the AC adapter is
plugged in

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