Why do monks use shields?
1. Roleplay - "the play's the thing to catch the conscience of the King." i.e. it's fun.
2. Tanking - happens very infrequently, but if I've got a mega melee mob I sometimes will use a lightweight, high AC shield just to wait for the dots to wear the mob down. Almost exclusively used when there isn't a War, Pal, SK, or *cough* Ranger around to tank.
2. Pulling - AC is nice for the attacks, esp if you can't pull far enough ahead to be out of range. But mostly, RESISTS!.
Zinj