Christian appears to give Michael a message

As Michael's tank of liquid nitrogen finally runs out, he starts hearing the whispers. Christian appears to Michael and tells him "You can go now Michael." Michael's response is "Who are You?" Then the freighter explodes (that's for the next post though).

Hopefully this isn't the last time we'll see Michael. It really seems that the character really didn't get a chance to redeem himself in season 4. He gave his life to help to save the losties and the island, but he never got a chance to interact with many of the people most deeply affected by his past actions (ie Hurley).