Bilbo (Martin Freeman) is on the right. I thought he was a good modern day Dr. Watson on PBS. He's also the right size to play a hobbit.
Whew! You had me worried for a moment before I saw “on the right”—the guy on the left could play Elrond. Bilbo and any hobbit needs broad, Celtic facial features. I see the dimpled chin is back. Did anyone notice that all men and hobbits in TLOTR had cleft chins? Aragorn, Eowyn, etc? None of the elves had dimples.