Hey, you guys should really read this book. It's what the new TV series is based on, and has some good debate between the scientist main characters about how time travel works as well as the existence of free will given the fact that everyone's consciousness leapt forward 21 years (is what they saw there set in stone? can they change the events to have a better future? can they avoid/prevent their own deaths? etc. etc. etc.).
I'm about half way through it now and am really enjoying it so far. Anyone else out there read it yet?