Shoutbox

Next series they will probably focus on the others, since the main characters are now being held by the others.

The produces have already said that Fake Henry (aka Fenry), is going to be a regular character in Series 3.
Also, the show is going to have stuff happening outside of the island.

And now for my theory time...

I think the ElectoMagnet was being used for something useful, and the button was like a "reset loop", however, there was a provision to destroy the EM, aka The Key and that was only to be used in case of emergency.

So now the EM is gone and the threat of whatever it could have done to destroy the world no longer exists, however, whatever it did no longer happens.

My guess - it no longer provides a force field of some sort, and so the island is not invisible, or at least accessable, which is why Micheal can go and get rescued, and its why Miss Widmore's team suddenly found the magnetic anomoly.
And the thing that would happen if it was never reset, would be that the magnet would get so strong that everything remotely able to get magnetically induced (which is basically everything) would get sucked into the magnet, like a black hole.

Also, the real Henry Gale, who came in a balloon, I think was sponsored by Widmore Construction (this actually happened, on the balloon cage it says "sponsored by Widmore Construction and Mr Clucks - the place Hurley worked) because Miss Widmore said that he has to go round a certain route to try and find the Island where Desmond crashed.

Widmore Construction, I think is probably affiliated in some way with Hanso which is why she knows Desmond is on the island and why there was a Widmore pregnancy test on the island.