I use to work in a daycare and we had a biter ...... this little boy drew blood and all ! We tried binkies and frozen teething rings. He was over 2 so none of that worked. We had to watch him very closely. I was close with him so I knew when he was about to bite and stopped him before he did it.
You could try the binkie or Teething ring deal .... you know your son and if that would even work.
You could also just to the time out bit..... I love the time out but you have to do it right or it will not work. My husband does it all wrong and my girls mis behave all the time !!!
Go to Super Nannys Website www.supernanny.com ....... she has tons of advice for just about everything ... she might have a solution for biting !!! I love watch her shows ... she really is amazing ! Wish she could come to my house :) Good Luck !