The Whisper transcripts on LP made me realize that everyone's voice that has been recognized as a whisper has died or had a brush with death. That made me think of 'out of body experiences'. While reading up on that I came across Astral Projection. PLEASE READ http://en.wikipedia.org/wiki/Astral_projection. What if some or all of our islanders could do this at will, and maybe they just don't know it yet.
It could explain a lot of things on the show. Like Appolo bars, whispers, visions, dreams, and even what the island is. http://en.wikipedia.org/wiki/Astral_plane If it is an astral plane then technically it would not be purgatory like TPTB have said it is not since season 1.
If this has been mentioned before I apologize in advance, I didn't recall seeing it on the blogs.