These are the theories that the writers/creators of LOST have disproven for us... And there are some sources to prove their disproof (new word).

* The survivors are dead and/or in Purgatory.
Source- http://tv.zap2it.com/tveditorial/tve...7C1%7C,00.html
* The survivors are in a time warp.
* Spaceships or aliens influence the events on the island.
Source for the two above- http://www.scifi.com/scifiwire2005/index.php?id=30246
* Everything seen is a fictional reality taking place in one or more of the survivors' minds.
Source- http://losttv-forum.com/bonus/interview.htm
* The "security system" is a dinosaur.
Source- http://www.lost-tv.com/exclusives/damon081804.html
*
the article here http://www.ew.com/ew/report/0,6115,1...7C0_0_,00.html
states:
The pirates are, in fact, ''the others'' on the island, about whom Rousseau (Mira Furlan) warned the castaways. Which means that the kidnapped boy Walt (Malcolm David Kelly) shouldn't be too far away. I know I've read threads out there where people think Walt was taken far away or to another island, or that the people who took Walt were not the others.

The plane did not crash by accident. It crashed for a very specific reason.
The castaways are not "ghosts stuck in a tropical limbo"

Some have observed that the Orientation video and the missing section have differences in Dr. Candle's hair and his tie. And I think some have theorized that this is of some significance. This was posted by Javi, writer/producer on the Fuselage. http://www.thefuselage.com/Threaded/...ad.php?t=28950
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I have seen some of those ^ components in some of your theories, so I thought it would be easier to have a one stop reference to help you out.

Oh and praise Wikipedia for helping me with some of the links.

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