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As to whether they are on the "island of healing," I don't think we know where their homes were before the Losties came. The screen capture posted a while back seemed to show it on the same island as the two main crash sites. The Others may now be on an adjacent island, or they may be on the end of the same island; remember it was Henry/Ben that told Sawyer the other island was his original location and I don't trust a thing that he says.

I think the secret may lie in the way the Losties and Others have been segregated on the island. The "healing force" may only be present on the end of the island where the Losties are. It may end where the black rock line of demarcation is. I think it's also possible that the "smoke monster" or force of whatever kind it is may not be a threat to the Losties but a definite threat to the Others, which is why they go past the black rock only in small groups or alone and don't roam freely there.

It may also be that the healing force on the island only works on those that are there against their will since it seems the Others are perfectly happy being there. If they weren't, they'd have used their boat to seek rescue long ago.