I love that I can use "Dog Whisperer" discipline and training tools on my cats, especially Harry.
I first tried some tricks out on Luckie a couple of years ago, like "claiming my space" to keep her out of the bathroom without me having to close the door. All I needed to do was look at her the second she crossed the threshold and she would stop and just sit down. That was it!
With Harry I've used a lot more tricks because he is much more apt to do things I don't want him to, like jump on things he shouldn't, chew on things he shouldn't, attack Luckie when she's sleeping, etc. He responds very well to all the "dog" tricks Cesar Millan talks about. One chief point is that just like with dogs, the trick is to stop him before he does the "bad" thing, rather than letting him do it and then punishing. Punishment doesn't do much except instill jumpiness, IMO.
I think the most successful experiment I've had has been in keeping him away from Luckie's food during feeding time. Once a week I give them wet food, splitting a can or pouch and giving each an equal amount. It used to be that Harry would wolf down his portion and immediately push Luckie out of the way and take hers. Luckie came to expect this and would only take a couple of bites before walking away from the food in advance. She just gave up the idea of getting the "good stuff." But then I starting thwarting Harry, giving him a "look" and sort of tsk'ing at him when he was about to go towards Luckie's food. He got it -right- away. He would just sit down and watch Luckie eat. Now, after I've done this training with him for some weeks, I don't even have to tell him usually - he finishes his meal and just walks away and lies down in the corner. Luckie meanwhile gets to enjoy her food in peace.
I've read that Maine Coons are easily trained and yeah, I must agree. I also agree with the general assessment that they are very "dog-like." Harry is -such- a dog, it's like having a dog who uses a litter box and hates leashes. I wonder what Cesar Millan would say!