Ah, I see. I dunno, I think he's right to not worry about AC (even if he did it accidentally). Of course, I also don't buy the idea of a Monk as a tank. If I'm optimizing a Monk, there's going to be Leap Attack, Shock Trooper, and Battle Jump involved. That way you can get very high damage (make sure to get large so you're not sucking up AoOs on the way in when charging), but your AC isn't worth considering (but that way you don't need to worry as much about Dex and Wis or spend much on AC either, and thus that portion of your WBL can go into hitting things and hurting things). And you can be useful with Diplomacy when talking is the thing to do.
Not saying I agree with Giacomo's logic at all here... the UMD thing is rediculous, and his "tanking" Monk is incapable of tanking, plus the idea that he's an awesome Wizard killer is insane. But you can make a pretty darn respectable Monk that's strong enough to play with the melee big boys like Warblades if your DM lets you really push the optimization (and the ToB player isn't optimizing like heck too).
I actually did back up one of his claims a while back, where he said a monk could do over 1000 damage a round. Of course, the way he did it involved someone else buffing you, but with the Feral template and Shock Trooper, it's actually pretty easy.
JaronK