I was surprised they trotted out Walt. He's aged a LOT and I was sure they were going to continue the ruse of "you can't see him". (We saw the actor in a guest shot on My Name Is Earl a few weeks back.) Since they waited so long I guess people have sort of forgotten what he looks like, but still, he was freakin' tall in that scene.
Michael is an ass - I couldn't comprehend delivering up 4 people (much less 4 plus killing 2 myself) in order to save one person, no matter who that person is. Sorry GD!
Eko's "faith in the button" seems a little bizarre. Push it, dig it, sure, but sit in front of the monitor and don't attend the funerals, even though he's the resident priest? Remember, Libby was his comrade in Tailie arms and Ana Lucia was his Fearless Leader (though we all know he only follows his own path).