Who knows about the island?

I'm yet to see Recon because I'm in Australia and I'm waiting for it to download and so I'm watching Dr Linus. In it Roger says;

ROGER: That's why I signed up for that damn Dharma Initiative and took you to the island, and... they were decent people. Smarter than I'll ever be. Imagine how different our lives would have been if we'd stayed.

So.... Obviously Ben knows about the island - Now here are my questions.... 1. How much does Ben Know about it? 2. Do any of the other characters in the FST know about it? 3. If they they do how? and how much do they know?

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