What I did when Major was biting was pull my hand away, say NO!" and ignore him for about 10 minutes. He caught on quite quickly, and rarely does it anymore. If he does though, I say NO and leave again.

I would get the book The Dog Listener by Jan Fennell. (or from the library) I recommend it alot but I don't think that many people take me up on it. It is one of the best books I've read though, extremely good, basically about how a dogs mind works. Very effective ideas, not so much training, but behaviour problems. Wonderful!