I'm usually pretty picky when it comes to reviving characters (I don't really like this concept as it usually cheapens the character's death greatly), but for Agent Coulson I'm going to make an exception. I mean, we never actually saw him die and the only 'proof' we've got is Nick Fury's words (who tends to lie a lot) and a deck of cards with blood on it (which were taken from Coulson's locker by Fury... who lied about Coulson having them on him, again
). But even if Coulson DID die and they're gonna use magic jumbo-bumbo to revive him... as long as the TV show is awesome, I'm fine with it.
SON OF COUL LIVES!