I couldn't believe it was Locke in that coffin. How the heck did he get of the island - WHY did he get of the island? It leads to so many more questions! I sort of guessed after they all started saying Jeremy Bentham, since, like John Locke, he's a philsopher, but I was REALLY hoping I was wrong.
By the way, did anyone else find Sayid's "suicide" explanation unconvincing? I get the feeling that Sayid (or someone else on Ben's payroll) had Locke killed.