Martin Freeman, The Hobbit. I totally agree with Peter. Martin is *the best* person ever to play Bilbo. Not only does he embody what it means to be a hobbit very well, but he also has the quirkiness and humor of Bilbo himself.
"All the zillion times I have read The Hobbit over my lifetime, and never once did it cross my mind that Thorin might be hawt!"--- That awkward moment when they can read Tolkien, but can't spell "hot" correctly.