Every day, readers vote on the next action. I recommend starting here (the fourth story) as it's the best. It's been going for months, and there are literally thousands of pages.
Edit: Oh god, I just read it all in a day. My head hurts.
(, Fri 20 Feb 2009, 0:52, Reply)
It's got time travel, elves, strange dimensions, aliens, ascended gods, flying pirate ships.
It's a true epic.
(, Fri 20 Feb 2009, 2:10, Reply)