Love talking about this show...there is so much to question...
First off: Where is Alex? I don't think he's dead. I think he's out there and away from Mom. COuld he be the one who clocked Sayid?
Where does that cable Sayid found go? It went way out into the ocean. Could it be getting power from something out there (like the sunk ship).
Danielle said they were on a medical expedition. Could this have something to do with animals? (hence explaining the polar bear and other animals). She's obviously got a medical background.
Danielle killed all the members of her party because they were "infected". Did they get some island disease? Does the island infect you? Or were they not infected at all, but Danielle is?
What are the whispers in the forest? Is it just Danielle's imagination (I know Sayid heard it too -- could she have infected him?).
Who are the others on the island that Danielle brings up (but hides from).
There are so many potential group "cliques" and in fights too...Kate falling for Jack or Sawyer, Walt's allegience to his dad vs Locke, the Korean couple and Walt's dad, Charlie and Claire, the whole "camp" vs Sawyer...
Every time questions are answered more arise!