Our 11 month old has a new habit of biting - but not out of frustration or aggression. Depending on the moment, it's either curiosity - as in, what does Mama's toe taste like? - or affection, finishing off a big slobbery open mouthed kiss with a chomp. He's doing this to DP and I, and to some of his friends at daycare (all around the same age, and especially when he's excited to see them after a long weekend or a vacation).
So far, we have tried gently expressing pain (ouch! that hurts mama.), explaining that we don't hurt people with our teeth, demonstrating and practicing "gentle kisses," occasionally yelping in pain when he literally is a surprise ankle-biter (this makes him laugh), and more recently trying to quickly stick his own arm in his mouth mid-chomp, so he might experience what it feels like (this makes him giggle, too ).
Any other suggestions?