I was under the impression that the hatch door fell from the sky because the hatch went 'boom'. That whole time I was saying 'Don't let Charlie be dead, he can't be dead'. It was amusing, really.
But I agree with whoever said that Charlie is probably just in shock and/or has a concussion. Maybe he got knocked in the head by a frying pan or something.
I just hope Eko and Locke are still alive. I don't think they are, but I can hope, right?

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"To be a genius is to be misunderstood..." -Ralph Waldo Emerson