When is he biting hun? I know, oh how I know, it is really hard to deal with. My son has been a biter as well.
For a time he would bite me when he latched on, so I would put my finger out for him to 'latch' onto first, he would bite that, then I would latch him on. He soon stopped.
When he was biting at the end of a feed, I would just pull him into me. This cuts off their ability to breath through the nose, so they instincitivly open their mouth to breath. I would then immediatly set him down, even if he was not finished eating. He soon learned that teeth = no booby.
Hang in love, he won't bite forever. I know it hurts, but you can get through it.