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What Every BODY is Saying by Joe Navarro is an anecdotal account. Basically, every other page is a narrative of a personal experience. The book is a great short read, but it comes off as fragmented and tries to support claims about nonverbal signs of lying and discomfort that don't really stand up to verification (science is not on board with what he says).

The Definitive Book of Body Language by Allan and Barbara Pease is much worse. There is actually very little in nonverbal communication that is "definite". (Unlike words which you can look up in the dictionary, nonverbal behavior is context-bound and rarely gives off a "general meaning" the way words do.) This book is a re-hash is Allan Pease's earlier Body language how to read others thoughts by their gestures from 1981. He hasn't updated much since that time. Not only is it generally outdated but it is by and large based on a weird mixture of psychoanalysis and whatever anecdotal observations Pease picked up in marketing consultants' meetings in Australia in the 1970s. I highly suggest skipping this one.

If you want to get a picture of serious up-to-date science that's also easy to read, I suggest Nonverbal Communication: Science and Applications edited by David Matsumoto, Mark G. Frank and Hyi Sung Hwang. It's one part technical information by scientists who study nonverbal communication and one part personal experience with nonverbal communication by actual practitioners (including several by law enforcement agents, like Joe Navarro, but with less hope and fanfare and more practical observations). This book is a good introduction to nonverbal communication, what we know about it thus far for sure, and what actual scientists are trying to figure out about facial expressions of emotion and other aspects of nonverbal communication in the 21st century.
http://www.amazon.com/Nonverbal-Communication-Applications-David-Matsumoto/dp/1412999308
(It is also quite easy to find a PDF of this book.)

If you're not that into science but want to read about how to use nonverbal communication to your advantage I suggest Winning Body Language: Control the Conversation, Command Attention, and Convey the Right Message without Saying a Word by Mark Bowden. It's not technical at all and doesn't teach you to "read" others as much as to use your own body to give a better impression and feel comfortable. It is written very fluently and actually a pleasure to read - Bowden has used quite advanced verbal techniques to as-if hypnotize you while you're reading it (I've gone into a kind of trance every time I read it). Because it draws so much from performing arts (theatre, martial arts, etc) it may not stand up to science, but it's a terrific read and a lot better than the outright inaccurate and misleading alternatives above.
http://www.amazon.com/Winning-Body-Language-Conversation-Attention/dp/0071700579
(Also quite easy to find a PDF.)

I hope this helps.

Pretty much everything by Joe Navarro is worth reading if you're interested in body language; he's a retired FBI special agent that specialized in reading body language with the Bureau.

"What EveryBODY is Saying" is his best known book, and I highly recommend it as a gateway into his work.

I would shamelessly plug my own book here but I don't want to be that guy ;) Try Amy Cuddy's book Presence? http://www.amazon.com/Presence-Bringing-Boldest-Biggest-Challenges/dp/0316256579
It is not all nonverbal but it is still great

Read The Charisma Myth: How anyone can master the art and science of personal magnetism

HIGHLY recommended.

1. Microexpressions are considered "leaked" displays of human emotion. The whole conscious/unconscious/subconscious distinction is really a metaphor, since the human brain doesn't have those as distinct elements. So to ask if microexpressions stem from one or the other or a conflict doesn't really make sense.
   
   
2. No, microexpressions are at most, part of a person's emotional behavior.
   
   
3. Emotions Revealed by Ekman