My son, who is now 4 yrs. old, used to bite HARD! all the time too.
Your message said it all, though. Look at what happens before he bites and try to "deal with" that issue so it doesn't get to biting. So, before you talk to another adult, let him know that you'll be talking to someone and that you'll be 10 minutes. If he looks bored, distract him with an object (toy or book) or if he's too excited, show him other ways to express himself (like by clapping). In other words, get there before the biting.
With my son, we're doing the whole emotional intelligence, telling him to identify his feelings and how to appropriately express them. So, it's okay to be angry, not okay to bite. Okay to be tired, not okay to bite. It's really about teaching them to say "I'm tired" or "I'm bored," etc.
There are a lot of good books that identify feelings. DISCOVERY TOYS has one called "The Way I Feel" which is on sale for only $9.99. You can buy it at www.discoverytoyslink.com/fatimac
Even if you don't buy that book, expose your son (yes, at this early stage of his life) to the vocabulary of feelings. I find myself saying aloud "I'm very upset that the man driving the blue car cut me off! I wish we would all drive safely." and "When I'm tired, I get cranky. I need a good nap!" I see now that it has paid off because my son will say things like "That's it! I'm out of control!" Then he'll look at me and say "Okay, breathe in, breathe out. I need to calm down."
Your son bites because he doesn't have the tools yet to express himself. After you work at giving them to him, you'll see the biting go away.
Good luck,
F.
www.discoverytoyslink.com/fatimac