"The Rise and Fall of the Third Reich: A history of Nazi Germany"
by William L. Shirer
I have to say, this book is amazing. I'm on page 30 or so (just got the book and have had to study for finals) but I have loved it. The author puts it all together very nicely, and I would recommend this to anybody that wants to not only learn about Hitler's past (for instance, his last name used to be Schiklgruber [sp?]) and then how he accomplsihed what he did.