Liland, I am with you there, it is quite common to hear the phrase "between you and I" uttered by people who should know better. And I wouldn't classify such concern as pedantry.

True pedantry raises its gnarled head when the question of split infinitives arises. I have long held that there are occasions when it is desirable, nay compulsory, to split an infinitive for the sake of proper emphasis, despite what the rules of grammar might say.

Murray