[hanging head in shame] DD is a biter.
She's 28 mos. She's been bitten a few times, and a few times she has bitten others. Obviously, we have been working hard on getting her NOT to do it, and for the most part we are succeeding. As her language skills improve, she seems to have fewer urges to do it, but she's not completely past it yet.
Toddlers have been dismissed from this daycare for biting, but they do give them a chance to get past the stage, as long as they are not doing it unprovoked.
The teachers discipline for it, and we do, too. We instruct them to tell when it happens, and to use their words when dealing with another child. Essentially, just LOTS and LOTS of repetitions of "NO BITING! BITING IS BAD!!" Kids who get bitten get ice and lots of TLC from the teachers.