
The author of Tides of Light offers his Nebula Award-winning SF classic--a combination of hard science, bold speculation, and human drama. In the year 1998, a group of scientists works desperately to communicate with the scientists of 1962, warning of an ecological disaster that will destroy the oceans in the future--if it is not averted in the past.
The Difference Engine - William Gibson & Bruce Sterling Diaspora - Greg Egan Flashback - Dan Simmons Timescape - Gregory Benford Rendezvous with Rama - Arthur C. Clarke (but the "co"-authored sequels are too terrible for words)
Actually, just reading through the list, I was a little disappointed. Yes, there are some great classics, but Timeline" by Michael Crichton as the "time travel" sci-fi novel of reference. No, just no.
For time travel based sci-fi, Timescape by Gregory Benford is my pick of the lot. Bedford is actually an astrophysicist, so his version of time travel actually make sense. Plus, the characters in the books are scientists. It's a very thought provoking book. He has a second book along those lines, Cosm, which I loved as well, for it's portrayal of the lives of scientists.
Bill Joy went through a similar phase with his infamous grey goo manifesto. I think he has come back somewhat from the brink on that.
I can appreciate the fear aspect of it. Greg Benford's TimeScape [1] scared the crap out me.
