They're all clones.
Genetically altered to allow them to live on a island made of anti-matter (hence all the light/dark stuff), implanted with the memories of the passengers who died in the original crash (hence Locke's legs working again). The weird things on the island are aspects of aliens drawn to the island's ability to exist between planes of existence.
Not that I even care that much, as it's going on too long, but if I'm right, I want my five pounds.
UPDATE: Not quite as funny as links to people rapping angrily about cupcakes and kids' films, but there's a link over at Neil Gaiman's blog to a PDF of the decision in the Pennsylvania "Intelligent Design" case -
here. Important and surprisingly readable, especially as ID/Creationsm has already taken a moronic foothold over here, and needs to be stepped on sharpish with the Firmly Laced Trainer of Fact.
Having wittered on about Lost, I should probably admit that I didn't even watch the second half of last night's episode, as I was distracted during one of the BILLION commercial breaks by the Newsnight special on the end of the oil era, which turned out to be the most gripping television this year. Completely fascinating, and even with some tiny piccolo notes of optimism, which is always welcome. Worth watching the video replay if you have time and broadband.
Fourth edit of the book now, and it's a biggie, as m'agent's American counterpart got back with her notes, including the revelation that if you're reading the thing not knowing what happens at the end (which obviously I do, and m'agent does as well as I told her the end before I wrote it), then there's a big chunk of the middle which doesn't seem to go anywhere at all. And she's quite right. Fortunately it's quite a simple fix, but it will require a few more days hunched over the keyboard if I want to get the thing out to publishers by mid-jan.
Other random stuff:
Royksopp's rather good What Else Is There. Spooky video, and a floating Scandinavian bird* with no eyebrows, marvellous.
That really old trailer for Jerry Seinfeld's Comedian film from ages ago, which I still haven't seen. But then I've only seen one Seinfeld episode, which I must rectify at some point.
* As in 'bint' or 'lady'. Sorry Dave