Absolute OpenBSD is fantastic read. I think the way it's written, organization, and clarity should be a standard for technical-for-non-technical styled books. I've been making my way through it as I wanted to learn more about pf and I'm currently learning C, so where better to look than OpenBSD's src?

In the realm of fiction, I've just finished the Malazan Book of the Fallen series by Steven Erikson. He and his friend Ian C. Esslemont began trying to create a world for the GURP table-top RPG, and someone convinced them to write books set in the universe instead. If you like world-building, magic systems, high fantasy, epic stories, I wholeheartedly recommend it.

If you're more in the mood for science fiction and you've never read Frank Herbert's Dune, please do so immediately. Don't even go to work. Dan Simmons' Hyperion Cantos is amazing too.