The sci-fi books I have read shaped my perceptions of GalCivII b4 I ever played. I'm learning new things every day, like any Human should try to do, but looking back over my short career playing GCII, I see some interesting things.
The 2 most relevent series of books, to me, are the Honor Harrington series (Author: Davis Weber, Baen publishing) and another one that's older but I can't find one around here anymore, but I remember an early one was called "Man-Kzin Wars" If I had one I'd list the author etc. as well.
Actually the second was most like GCII IMHO, since the background of it and the follow-on books progressed through several encounters with alien races, including some dumb mistakes and simple incompatibilities that resulted in conflict. I like the way it ends up with all the stupid stuff getting worked out and general respectful peace in the Universe just b4 the Really Nasty One showed up to eat everyone, the Arachnids ...
Anyway, what are some good sci-fi you have read, anyone? I'm always looking for something good to read.