If you watch Lost and are completely left up a creek without a paddle after five series of travelling back and forth through time, I suggest reading Jason Hunter’s brilliant explanation, Lost: A Theory on Time Travel. I think I might actually finally understand something of what is going on.
If you don’t watch Lost, well . . . I have to say I don’t blame you. It being on Sky is irritating for a start (my dad’s friend records it for us every week) and it got very wierd in the middle. However, perseverance has been well worth it!