An excellent book also strongly recommended by Charlie Munger and an important component of the mental models you need to make sense of the world.  Basically, Cialdini summarizes and explains in an extremely accessible manner loads of research that suggest a number of short cuts that people are pre-wired to take.  Unfortunately, these mental short cuts make us prey to manipulation.  Awareness seems to be the best defense, and sometimes, these tools can actually to used for good purposes as well (for example to dissuade someone from doing something that would be destructive to them).  

A sublime book and beautiful in its scope and message.  Frankl has hit on some profound truth that are worth exploration and reflection.  Advance readers might want to follow this up with Man's Search For Ultimate Meaning which is a more technical but also quite profound work as well.

A bestseller, but still worthwhile.  I had the opportunity to hear Covey speak at the Harvard Business School before I picked up his book and his message continues to resonate because it is timeless:  Work from the inside out, focus on win-win relationships, and take responsibility for yourself (this is an over simplification, so read the book!)

I was very skeptical that Anthony Robbins would have anything worthwhile to say.  By the time I read this book, he already had a relatively high media profile and the fact that he did a lot of seminars took me back to the bad old days of no money down real estate pitch men infomercials.  Boy was I wrong!  This book is densely packed with deep and worthwhile insights on a range of subjects like autosuggestion, visualization, diet, personal effectiveness, etc.  Each chapter could almost be a book in itself.  This is one of his earliest works, and probably one of his best.

A cheesy title but a worthwhile book.  It is about more that growing rich.  Offers insights on the nature of reality and setting goals and achieving them.

A practical guide that offers a number of fundamental insights on relationships and people's motivations.  Don't let the title fool you, because it is not about manipulating people.  Rather it is about being sincere and communicating your message most effectively.  A classic.

An interesting book about the stable of outstanding managers that Warren has assembled.  They have tended to get overshadowed by the boss so this book is a welcome addition to the complete Buffett library.
 

David Sandler was a genius in teaching others to sell (though perhaps not in picking good book titles).  This book is an outstanding introduction to his approach to selling and marketing by first utilizing a process focused mainly on finding out if a prospect has any pain that you can help to alleviate.  His is an integrated system drawing upon the wisdom and experience he assimilated for a variety of fields.  What you will learn from this book is applicable far beyond selling. 

Charlie Munger is a big Ben Franklin fan, which led me to this book, and I can see why.  Ben was the original American Horatio Alger and all around renaissance man (not to mention ladies man).  Lots of lessons for the thoughtful reader.

A tremendous novel that I want to read again now that I have grown up.  A classic that captures the feelings of adolescence and New York City through the eyes of a child.

An incredible, funny, moving novel about the life and times of King Arthur and the original Camelot.  Originally published as four separate books that were combined in this collection.  Timeless and magical.

There has rarely, if ever, been a world of pure imagination as complex and creative as Dune, the desert planet.  Herbert covers a broad swath of imagined distant future human history in his original five novels.  Even though the novels are, at times, dense and difficult, the sweep and imagination are awesome.  I recently discovered that his son has written some prequels that are also worthwhile, thought different than his father's original works of art.
 

The Lord of the Rings have finally been made into a movie worthy of the books, but Tolkein's achievement towers above almost everything else in its beauty and imagination.  If you are new to both, read the books first so that your own imagination is unconstrained by the movies.

Asimov's attempt at charting a future (or was it past?) history focusing on robots.  Though not at the level of Tolkein or Herbert, still quite good (Note: its been a while, and I don't remember that much).  This is a trilogy, and the above link is to the first one in the series.

Atlas Shrugged (and its predecessor The Fountainhead) are great books.  They are long, take effort, and are sometimes annoyingly pedantic.  However, there are worthwhile nuggets and the stories and characters can also be moving and/or compelling.  Like C.S. Lewis' 7 volume Chronicles of Narnia, these books offer in literary form an encapsulation of the author's philosophical or theological views.