I agree with Dude on almost everything
(Except that 2 year olds act the way they do because their parents impose few rules and consequences - I've seen quite a few "terrible twos" behavior even among families where there were strong consistent rules etc - I think the "terrible twos" is really just a very normal part of development that most children go through - although not always at exactly 2 :)).
The only piece of advice I'd add is a trick we used with our kids when they were that age - distract with humor. Basically get there attention off of whatever is causing the fight-back and get the both of you laughing. It's good all around, and not ever moment is a teachable moment - sometimes you just have to have fun
polarbear
