What the crap??!!!

SPOILERSWhat the crap was up with Lost?! It was a GREAT episode but I'm still recovering from the shock of it all.

Questions that arose during this episode

Is Locke really dead?

Who the fuck is Jacob? Why is he invisable? Is he really invisable?
Why hasn't Alpert aged?

Can Ben get any more evil?

What happend to Annie? They couldn't just show her and not tell us what happend right?

Who came up with the idea to kill off the peeps from the Dharma Initiative?

Questions answered
How Ben got on the island.
The beggining of the Dharma initiative(kinda).
As always Lost has left us with more questions than answers.