there's been a hugh conflict between white v. black through the whole series (games that are played between walt and locke, charlie's slip-on's, the stones...) so when i see jacob in white, the dude in black...that makes a lot of sense. I had read that dude was the monster and appears as a black horse to kate, christian in white to jack, yemi in black and white to eko...etc.
so the island might be like atlantis and a playground for gods? obviously jacob isn't toast yet but i'm really stoked to see why and how he visited each and every one of survivors that he did...and why he visited some of them as children pre-crash, and some of them after they are rescued (hurley & sayid). why the fuck is he always touching them too.