It's no secret that I love the book The Millionaire Next Door: The Surprising Secrets of America's Wealthy.
I love it so much that I have an entire category here at FMF dedicated to it with over 70 posts in that category!!!!
- Rich People Know that Things Don't Satisfy
- How to Become Wealthy
- Best of Free Money Finance: Millionaire Next Door, Part 1
For a good overview of the book see The Best Personal Finance Books of All Time: The Millionaire Next Door.
If you have not read it, do so. If you have, read it again. You'll probably find something new to help out your finances (FYI, I've probably read it as many as 10 times now and always get something from it.)