Lost

If you're a fan of the show Lost, you'll most likely know the feeling of loosing track of the countless open questions of the plot. Darkufo - Community of Lost-fans to the rescue. With categories such as Mysteries (current count 184!), Answers, Rumours, Connections, Theories etc. you have a chance to get updated on what you've seen. I guess you'll have to be careful not to read to much, though.