Ok, this is a little bit of a lie, but I've just finished watching the Season finale of Lost Season 3 (people who have Sky One will get to watch it in about 25 minutes). All I will say is that as series arc goes the route their clearly going in Season 4 is an interesting one.
There is resolution, and, in my head at least, a rough explanation of what is going on. Season 4 is in the making now and switching to flash forwards is a clever move. Anyway, Big Brother starts on Wednesday so that's 10+ weeks of brain chewing gum sorted whilst I wait for some new Sci-fi.