AH! I love so many! Um.. I love Plane, The Remedy, You and I Both, Little You and I, A Beautiful Mess, Dynamo of Volition, Hey Love, Not So Usual... you know, I think I should just say all of them =] I really can't chose between just one.
I love all of his songs, but my three favorites are live high,because it is so powerful and meaningful, love for a child, because that song touches me( it almost made me cry) or coyotes because it's just an awesome song! I love the kid at the end, he has talent. Oh, and curbside prophet! It kicks butt!
I'm surprised not many people have mentioned "If It Kills Me", the Casa Nova Sessions version is probably my all-time favorite J.M. song (NOT the radio/album version though). Also a big fan of Gypsy MC ( http://www.youtube.com/watch?v=bv5Tpcw-z84 ), and Please Don't Tell Her. But then again, I love a ton of his songs!