I hated the biting stage and dreading going through it again with DS.
I learnt a good method from DD's kindy when she went through it about 18 months. Basically when they bite, you yell loudly and put them straight down - ignour them. They often get a bit upset, but you have to leave them for a minute so they can learn to link their action with the reaction.
If you have some-one else around, make sure they bung attention on the victim, ignouring the biter. If its another kid, then make sure the victim gets the attention adn also watch out that the biter didn't do it to grab a toy from the victim. If so, make sure they don't get the toy.
I found this very effective with DD, took a few goes - but she soon learnt the link and stopped. She did go through the biting stage again later, when she was a bit older - that was out of frustrating to other kids and fighting over toys and things.
Best of luck.
DD is 3yr 8 months - DS is 6 months