Haven't had a chance to play these yet but they look interesting:
1. A small expansions which adds a bunch of new Identities for the original game (my favourite of which is Crazy Joe: you win if there are enough paradoxes out that everyone else loses...probably fairly hard to win with though).
2. Early Americans Chrononauts - a new timeline running from early North American history through to early 20th Century).
Has some new types of cards (but I don't have details with me at the moment), and can be combined with the original game.
Not sure how well that will work given that the original identities wouldn't reference the earlier time line (and possibly vice versa). This could reduce the care factor of flipping linchpins (eg my Identity doesn't care about that section of the timeline so *shrug*).
If you cannot see the causal relationship between "I have chocolate" and "Life is Good", you simply aren't trying hard enough. Pirates of the Burley Griffin