Recently I've been reading through the "Area 51" sci-fi series, by Bob Mayer. Basically every historical event or site that has ever caused anyone to scratch their head over is woven seamlessly in to an awesome 10-book series. He started writing under a pseudo-name, but all of this series has been re-issued under his own name in ebook format.
The Wool Omnibus (the first 5 books in the Silo series) by Hugh Howey was great. I tend to like books that keep me guessing, and this series had a few blind corners.
John Scalzi's Old Man's War was awesome. I immediately started reading everything of his that I could find (more books in the series are The Ghost Brigades, The Last Colony and Zoe's Tale). I stopped reading Scalzi when I got to his latest work "The Human Division". Not because it isn't good, but because he published it one.chapter.at.a.time. And priced each ebook chapter as if it were just another kindle book. I highly recommend his writing, but he lost me as a customer when he did the money grab.
Joe Haldeman's The Forever War is also extremely good, and is written in the same style as Old Man's War.
The Lost Fleet series by Jack Campbell was great. It was the first sci-fi I had read that incorporated the reality of time lag due to distances involved in to the fabric of his space fleet warfare tactics.
Richard Bode's book "First You Have To Row A Little Boat" should be required reading for everyone. It's a fairly short book and a very easy read, but it will grab you by the shirt tell you some important things about life. A quote from the book: "For the truth is that I already know as much about my fate as I need to know. The day will come when I will die. So the only matter of consequence before me is what I will do with my allotted time. I can remain on shore, paralyzed with fear, or I can raise my sails and dip and soar in the breeze."
"The Martian" by Andy Weir is a great sci-fi Robinson Crusoe kind of book about an astronaut that gets stranded on Mars. Believable techie survival story with some humor tossed in. Very enjoyable.
The Art Of Racing In The Rain, by Garth Stein. Be prepared for spontaneous onion-cutting and inexplicable allergy attacks.
02 Golf, by John Purner. Non-fiction about a new pilot and his new-to-him plane. Some parts will make you want to reach through the book and slap the back of his head, but it's an honest and completely engrossing enjoyable book.
A Lonely Kind Of War: Forward Air Controller, by Marshall Harrison. A non-fiction book about the life of an OV-10B pilot FAC in Viet-Nam. I had a hard time putting it down.
I bought/read Mop Men by Alan Emmins and Dead Janitors Club by Jeff Klima after watching the movie Sunshine Cleaning. Both are non-fiction books filled with funny/gross/disgusting/fascinating stories about the life and times of crime scene cleaners.
For pure fun reading where you are required to suspend all disbelief before opening page one, I highly recommend anything by A. Lee Martinez. Monster is a good one to start with. Kind of like crime scene cleaner meets monster hunter, and hilarity ensues.
If you like Cold War stories, Nelson Demille's The Charm School is a must read. I could seriously believe that this place and those people actually existed.
Those are most of the good ones I've read (or re-read) so far this year. Oh - and I'm frequently seen with my nose between the pages of the Gliem PPL study guide.