I would just repeat the consequences you already mentioned.  I wish there was a long drawn-out philosophy behind my answer, and maybe someone else has a kid-tested, mother-approved solution, but I think as long as there continue to be consistent undesirable consequences for actions, the message gets through eventually.  I think kids are in a constant research mode, continuously testing if/then theories.  "If I do this, then that happens."  So we have to stay consistent to reinforce their findings.  :-)

I've heard of parents biting their kids back. I don't think I have the guts to do that, but I suppose there's no magic answer here! Like Kevin said, just be consistent.  I've had to figure out the one thing for each kid that really drives them crazy to get them to behave.  My daughter dreads timeouts and for my son we will take something away that he loves to play with. Just got to find something appropriate for their age I suppose.

Good Luck, My daughter was a biter for a week or so, but I can't remember what we did to stop it.

It's hard!  Mostly because you just can't get into their minds to figure it out.  My normally well working people skills are no match for the 18 month old of my life!  :)

I don't know if this would help, but there's this book,

.  We've used three others in the series to various effect, Hands Are Not For Hitting, Tails Are Not For Pulling, and Germs Are Not For Sharing, but hey, it's worth a shot.  Good luck!