Hi Depends a lot on what you like of course. Foundation is in the "space opera" category, and the recommendations made so far ar pretty good. I would add Dan Simmons; the Hyperion series and the fantastic Ilium and Olympus. At the other end of the intellectual scale is the Lensman series from e.e. "Doc" Smith - very light weight and probably out of print by now, but I enjoyed them in my youth. Moving slightly further afield, any self-respecting geek needs to read the early William Gibson stuff: the "Neuromancer" series. His later stuff tails off badly, but the Neuromancer trilogy is very good. The other one for all geeks is Vernor Vinge; try "Across Realtime" for the best visualisation of what the coming Singularity means, or "A Deepness in the Sky" for great space opera. If you like hard science, Greg Egan is the man - he will mess with your head mercilessly. Try Permutation City or Diaspora to see what can be done with current theories on quantum physics or computation. Slightly more adult is Richard Morgan with his Kovacs series, starting with "Altered Carbon". Lots of violence, some sex, lots of good SF with real plots and people. Last but not least, we should not forget the old master, Robert Heinlen. A lot of his later stuff is drivelling nonsense, but "Stranger in a Strange Land", "Moon is a Harsh Mistress" or "Starship Tropers" still bear up. Got plenty of other recommendations, but that lot should keep you busy for a weekend... :-) HTH Regards David Evans InaPlex - Enterprise Data Integration http://www.inaplex.com