A few favourites off the top of my head: The Difference Engine - William Gibson & Bruce Sterling Diaspora - Greg Egan Flashback - Dan Simmons Timescape - Grego

A few favourites off the top of my head: 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)