I'm not a huge reader of technical books these days, mostly because the most up to date information can usually be found better online. That said I read pretty much anything that comes out of A Book Apart and not just because I'm one of their authors. I like the short, focussed approach of those books.
I like books about planes and travel, I recently read Skyfaring by Mark Vanhoenacker, who is an airline pilot and writes about travel and the business of flying in a lovely way.
I read books about running, Eat and Run: My Unlikely Journey to Ultramarathon Greatness by Scott Jurek is excellent. Also Life Without Limits: A World Champion's Journey by triathlete Chrissie Wellington is a good read.
Fiction, I have always loved the books by Colette. I studied music theatre at college and wrote a musical based around her life and some of her earlier books.