Daniel is actually pretty up on the whole idea of "please" and "thank you." And he's even moved into using "you're welcome" without my really trying - just the osmosis of hearing me use it. What cracks me up is when he gets absorbed in something like Curious George, or driving many of his 8,459,876 cars around and we have an exchange that goes something like this:
Me:Don't you mean, "More milk please?"
Like the whole milk thing is totally my idea. Toddler psychology. Gotta love it.