The Automatic Millionaire by David Bach is a great book on personal finance that Kathryn suggested I read. David Bach's book is a very simple guide to developing a good foundation for personal finance. If you feel uneasy or a little worried about your financial future and not sure what the first steps you should take, The Automatic Millionaire gives some very succinct advice on what you can do to take some steps in the right direction.
I know there are more books out there, but it's important to at least start somewhere. It was an excellent introduction and I'm very glad I read it. Highly recommended!