Quote Originally Posted by Chicken Sandwich View Post
I don't think so. "To whom are you talking" isn't any more proper than "Whom are you talking to?" It's entirely acceptable to end a sentence with a preposition.
I don't think that the preposition was ever the problem. It's the who/whom distinction that euncu talking about, I believe.
But since you've brought up "Whom are you talking to?", I'd call that bizarre, while "To whom are you talking" is just unusual (and all those other descriptions above).

The correct way of expressing in formal writing something that only occurs in speech obviously depends on the context in which you'd want to do that.