[Gorwingel]

Boromir didn't even handle the ring in the movie, so that basically means that he never handled it in the book.
I never thought of that, that the people who had prior knowledge of it almost never became very corrupted about it, it almost took them by surprise. Though Frodo eventually became corrupted with it, even though he knew about it being evil (Ooops, movie moment, realizes that he has the ring for a few years or so before Gandalf actually comes back and tells him all about the ring) but that is probably because he was going to Mordor