I love Lost. It's kinda funny seeing some of the cast around though when I was living in Hawaii. I ran into Evangeline (Kate) twice while I was out there, Dominek (Charlie) once, and Hurley once (he's a BIG guy, not just fat, he's pretty tall). The girl who plays Libby shops at the store my friend works at occasionally. And Dominek and Evangeline have been known to make out in front of her store. :P I've got a picture of Dominek taken from her cell in the store.
So many theories in this plot line, and yeah, I agree, Libby isn't dead. The Rodriguez girl probably is. She only had a 1 year contract anyway. I wonder how many seasons they'll drag this on for. Great writing though, keep everyone coming back for more.