Tank Men by Robert Kershaw is about armored warfare from World War I and II as seen by the tankers themselves. There's little varnish and the interviewees come across with a lot of emotion, good and bad, and as real people instead of cardboard caricatures.
The Most Powerful Idea In The World by William Rosen. The story of the invention of the steam engine (the machine itself, not necessarily the choo-choo sort), and the understanding of Steam Itself. While steampunk seems to have been beaten to death as of late, it's interesting focusing on that word's first syllable.
You Never Give Me Your Money - The Battle For The Soul Of The Beatles by Peter Doggett. The Fab Four after Brian Epstein's death and the upheavals involved, from the Apple Corps debacle, Yoko Ono, the Allen Klein/Eastman management battle, and they fought to be four individuals instead of one group.

@Myro, if you have an I-phone, the first five books are on iBook for free.

Sadly, no. I'm an Android guy, so unless Amazon is making the same offer (which I doubt) for use on Kindle, I'm afraid that's not any help to me.

Also, I've already got the book, I just need to crack it open. I still like having actual paper books over e-books. So it doesn't make sense to get digital copies online when I can just read the book.

Still pretty amped, though.