If you were really a Lost fan, we shouldn't need spoiler tags by now, but just in case... wrote:
* The island is the source of a perpetual battle between good and evil <--- Sort of... That would be mainly focused on the brothers Jacob (Good) and Man in Black (Bad). It's probably more about the island containing 'the source' or the 'light', and corrupt men wanting to use this power for their own dastardly desires. I guess that's 'good and evil' in a way
* The only way evil can kill good is by roping in other people to do it, exploiting a loophole <--- Again, focused on the brothers. The 'mother' of the two made it so they could never hurt each other. Loophole was influencing someone to do it for them
* Evil lures people to the island (?) in an ongoing attempt to fulfil this <--- Jacob felt that his title 'protector' of the island was coming to an end (may have been prophesying his death) so needed to pass the title onto someone. He chose those who have nothing or no one holding them to their own lives
* The Dharma Initiative are investigating the mystical nature of the island and the conflict <--- Yep
* Jack is appointed as the "stand-in" for good to kill evil, and he does <--- Jack finds after leaving the island that he has no purpose. He eventually finds his purpose in being involved with killing MIB
* The sideways realm is to prepare the characters that do die for death, and is all fake <--- Yep. Universe created so everyone can meet each other once again before 'moving on'
* Everything that happened on the island was real? <--- Yes
Out of interest, how were the numbers tied into this? I've read all about the Valenzetti Equation and what it means, but how does it tie into the story? Just because the dude who created it was on the plane? Or is it a total aside? <--- Total aside. They might as well of used 1,2,3,4,5,6 as the numbers. Pattern wasn't relevant, the numbers themselved seemed to be. Could be wrong...