Tonight's Episode of "Lost" 2/18/09 (spoilers!)?

So, who thinks that John Locke is really dead? Do you think he'll be brought back to life somehow post re- visiting the Island? Or is he gone for good? With him being Christian's (Jack's Dad) proxy on the plane, will that require him to remain dead, can he come back as some sort of pseudo-ghost like Clair and Christian? Thoughts?