A few books in the SF genre that I thought others here would like:
Rendezvous with Rama / Rama II / Garden of Rama / Rama Revealed. This series of four books by Arthur C Clarke are some of the best in SF that I've read so far. It's about our first contact with an alien intelligence, whose technology is far superior than ours. There was to be a movie based on this series, but it may have been cancelled.
2001 / 2010 / 2061. Also by Clarke. I guess most of you have seen 2001 and maybe also 2010? Both great movies. The books are excellent as well, again Clarke shows great imagination in coming up with fascinating ideas. There is also a book "3001", but it is not by far as good as the three first ones.
Contact, by Carl Sagan. This book is also on the first contact theme. Astronomers finally receive a radio message from outer space. A very interesting message, it turns out. This was also made into a movie, one of my favourite movies of all time, btw.