I used to rarely read books, even assigned readings for classes at school. This all stopped when I began attending UNM, where I discovered just how helpful reading can be in a class. Since then and up until graduation, I had little time to read books for pleasure, but now I have started a small library of books. I like to visit used books and buy some of (sometimes most of) the mathematical/scientific books.
Below are books in my personal collection that I have read or plan to read. All of the books, with the exception of the textbooks have been bought from one of two used book stores, Twice Sold Tales in Farmington ME and Lion Around Books in Quakertown PA. I recommend to stop into both places if you have an opportunity.
A Brief History of Time (1988)
, Stephen Hawking
A good description of this book for most people (including myself at the time) is, "Cool physics shit you probably don't know". It gives a great intuition for what time really is other than the usual innate thought of it being absolute, and that is in the first few chapters of the book. The remaining chapters continue on a pretty neat ride through other aspects of time, and the origins of the universe, fulfilling the reader's expectations resulting from its own title.


The Elegant Universe (1999)
, Brian Greene
This was a really cool book on String Theory with great analogies for the ideas proposed in the book, which gives you an idea of how Greene (and hopefully most great physicists) view problems and ideas from different angles to better understand their core. In the beginning of the book, Greene gives an intuition for special and general relativity much like "A Brief History of Time" does, but with many more easytounderstand examples. This sets up the necessary background/thoughts for the later description and discussion of String Theory.


Chaos: Making a New Science (1987)
, James Gleick
I had really high hopes for this book, and after reading what was most likely the best opening section to a prologue I've ever read, I was quite short of enthralled when turning page after page of the rest of the book. Gleick's writing style is pretty darn witty, and most certainly uncommon and uncanny in its description of things, all of which I am a fan. Such was the form of the beginning of the prologue in his description of things from Feigenbaum's nocturnal research style in the hills of Los Alamos to a physicist's view of what kinds of problems are (almost "snobbly") obvious. Unfotunately this section did not only reveal the imagery in his writing for which I was in store, but equally did it bring to light, with its cliffhanger abruption of a finish, his seemingly allovertheplace thoughts that lead to this book's own perversion of logical flow. He constantly begins a story that has relevance to the title of the book, pauses at a, usually, interesting historical semiclimax, and then repeats the process, every once in a while breaking the cylce to pick up a plotline which he earlier dropped. You begin to think it will be like this for only a few chapters before you realize that you are doomed, and can better spend your time reading something else. I can easily see how he came up with the title of the book. Now maybe this is intentional, in order to underscore the notion of chaos, but if so, it was too much for me. If I had to give an example of a manifestation of this book's flow in plotline, it would be that of any one of a few times in my life when a squirrel has jumped out in front of my car to cross the street, only to get to the middle of my path before realizing the oncoming threat, at which point frantic movements occur, leftrightleftuprightdownleft, before a final, possibly fatal, decision is made. Much like my braking for squirrels in such peril, I discontinued reading the book.
I really hope that I'm incorrect in my thinking here, so if you have read this book, I look forward to you telling me otherwise. 

Currently reading this classic. I've been wanting to buy this book for myself, and specifically at a used book store. As Jess and I have recently moved to Quakertown, PA, I have found a used bookstore there that had this (Lion Around Books, no website). FINALLY!! I'll let you know more when I get done reading... UPDATE (1/2/2012) I stopped reading this book for now since I wasn't taking the appropriate time to properly absorb the many intricacies of the book. Reading the book over a couple months in shorts spurts doesn't bode well for my seeing the beauty within.

 Flatland: A Romance of Many Dimensions (1884), Edwin A. Abbott
 Introduction to Mathematical Philosophy (1919), Bertrand Russell
 An Introduction to the History of Mathematics 3rd ed. (1953), Howard Eves
 The Quark and the Jaguar (1960), Murray GellMann
 Lady Luck: The Theory of Probability (1963), Warren Weaver
 The Cosmic Connection (1973), Carl Sagan
 The Mind's I (1981), Douglas R. Hofstadter, Daniel C. Dennett
 Einstein's Space & Van Gogh's Sky: Physical Reality and Beyond (1982), Lawrence LeShan, Henry Margenau
 Genius (1992), James Gleick
 The Web Of Life (1996), Fritjof Capra
 Faster (1999), James Gleick
 God's Equation (1999), Amir D. Aczel
 The Universe In A Nutshell (2001), Stephen Hawking
 The Black Swan (2007), Nassim Nicholas Taleb
 Principles of Mathematical Analysis, Walter Rudin
 Linear Algebra Done Right, Sheldon Axler
 Algebra 1st Ed., Michael Artin

Men of Mathematics, Bell
Someone told me that this was a classic, and since I like to learn about the history of both mathematics and science, I will sometime sit down and read this almost600pager. 
Einstein's Theory of Relativity, Max Born
Another one of those gems that I found at the used bookstore in Farmington Maine, which I visit each year. This seems to include all the necessary mathematics (for a general scientific/mathematical audience) for the physics leading up to and including the famous theory. It should give me a better understanding (or at least allow me to make a small claim that I know what is going on) than what I have gotten through Greene and Hawking's books listed above.