Mostly I've read a lot of science fiction. I started with Animorphs and Goosebumps as a kid and moved on to Stephen King and Michael Crichton in my teens. In my adult life I've read lots and lots of science fiction by a whole host of authors. It was some recent audiobooks that brought me back to Mass Effect recently, in fact.
In this thread I'll list some of my favorites with a brief synopsis of each and my thoughts on the book. I will discuss spoilers too, but I'll block those with tags in case you don't want to have anything revealed. I figure the rest of you might do the same in this thread.

This is a must read for any fan of hard science fiction. Albeit I must warn you the books tone not uplifting. Its' a very cynical book about aliens attacking humanity with overwhelming force and the survivors struggling to survive. The authors raise a lot of thought provoking and chilling questions about the nature of life in the universe and the evolution of intelligence, as well as the speculative psychology of a space faring species. The authors are not Gene Roddenberry or Carl Sagan. There is another book that works as a sort of prequel to it called "Flying to Valhalla". It is not as well known but is also very good, taking place on a much smaller scale in the same universe and restating the primary concepts of "The Killing Star" in a different way.

A classic that I'm curious to see put to film someday... or would be. Frankly I am skeptical that modern film makers would do the story justice. "The Mote In God's Eye" is a one off novel that takes place in a previously established setting but you don't need to know anything about the expanded universe to understand anything happening in this story. In fact, I've never read any of the other books, or its sequel (which I heard bad things about) but this novel remains one of my favorites.
The premise is a space-faring human civilization making contact with an alien race for the first time. This is not treated as any trivial affair with the story following the logical and methodical approach to this momentous occasion in great detail. The aliens are fascinating and memorable and I think that if you will discover they were possibly the inspiration for one of Mass Effect's primary species. Shades of grey are found all throughout the story in its plot and characters. It touches on some issues that are also brought up in "The Killing Star" in regards to species motivation and 'international' or in this case, interstellar, relations. I think that anyone studying international relations in school ought to read this.

By Vernor Vinge, "A Fire Upon the Deep" is a very creative, fun, emotional, and disturbingly predictive tale about a fantastic universe that is both soft and hard science fiction at the same time. Though this might appear to be a contradiction Vinge's universe actually makes sense once this feature is explained. The most interesting aspect of this is that spaceship design in the novel must incorporate laws of the universe that do and do not allow for faster than light travel. This book can also be a bit of a challenge at first because the first aliens you meet are quite alien indeed and it took me a few pages to figure out just what the hell was being described to me. It has some prequels and a sequel, but I haven't read them.

This is easily my favorite story by Arthur C. Clarke and it might even be my favorite novel period. An alien craft is discovered traversing the solar system and will eventually pass through and be lost forever. Before it leaves an expedition is sent to explore and catalog it. What I love about this story is that it reads somewhat like a mystery with each chapter unfolding and you learning something new. However each revelation is never what you expected, leaving you with yet more questions. Despite that, it becomes apparent that the author is not just throwing out random ideas without any concept of how they fit together; you can start to figure things out if you pay attention and think hard and are familiar with the concepts of interstellar travel, futurism, and such. There are sequels but they were written with a co-author and I do not recommend them. They forgo the exploration and mystery of the first novel in favor of petty human drama.
(I will list some other books in another post in the near future)













