@ 1st pass, I really liked Swank13's & One Bad Malafaala's thoughts however, there are these little nagging questions.

Back to that polar bear idea...
How would they get the polar bear down there? Unless of course the trained it to insert metal objects into the chamber, activate it, climb down the ladder, clear ice so that the wheel could move, AND spin that wheel. Those are some pretty well trained bears... maybe I should get one. And did they really manage to stuff a polar bear and one or two people onto the Orchid elevator? I suppose your theory could hold water, but there are a couple things we need to know first. First and foremost: Is there any other way to get to the wheel? And if there was I don't think Ben would waste time with the collecting of metal and the exploding of the chamber. I don't know... call me skeptical but it's the little questions like these that get me to disagree.
The 'wheel' and the 'transporter' (Not a transporter in reality, but a time travel machine, Ben said it himself last night he said 'time traveling bunnies', not 'teleporting bunnies') are 2 completely different things.
I agree with Lost n Detroit. The polar bear was time traveled teleported to Tunisia as an experiment. The moving of the island is a much greater magic trick than the time traveling and is located at the core of the islands power. The time traveling pod simply channeled some of the power into a single energy source so that the traveling could take place.
The real question for me is, when Locke asked Ben "so is this the Magic Box"? and Ben said no, then what is the Magic Box? I believe Ben was lying.
I agree that the polar bear was sent to Tunisia during an experiment. Animal experimentation was shown with bunny #15.
I believe the Orchid to be the "magic box," in that it is used for time travel & teleportation, but
yes, Ben
did use that term metaphorically with Locke. Locke did not simply wish his father into a big black top hat. The Others brought him to Locke as tying up those loose ends was required in Locke's journey to where he is now.
I'm guessing that a previous island move involved it suddenly appearing under a certain slave ship, leaving the ship mysteriously far in-land.
Agreed, however Lindelof has said that the Beechcraft's crash was related to the Island's magnetic properties.