I've been doing a lot of real estate reading lately, and this is what I would recommend (in this order... as they somewhat go from novice to advanced):
Start out with Rich Dad, Poor Dad- not so much a real estate book, but it'll really get those gears turning and make you think a lot differently.
The Intelligent Investor- by Benjamin Graham- This is a very tough read, and very boring at parts and mostly centered around stocks... but the principles within this book are applicable to ANY investment vehicle. It's considered the bible of stock brokers and is an incredible read... if you can get through it. It took me about two years because I kept putting it down and then coming back to it, until I finally forced myself to read 50 pages a night. Truly is a must read though.
The Ultimate Guide To Real Estate Investing (for free on this website) is the next best step you can take, as it's a super fast read and very easy.
The ABC's of Real Estate Investing- by Ken McElroy
The Beginner's Guide To Real Estate Investing- by Gary Eldred
The Advanced Guide to Real Estate Investing- by Ken McElroy
The Book on No (and Low) Money Down- by Brandon Turner
HOLD: How to Find, Buy, and Rent Houses for Wealth
What Every Real Estate Investor Needs to Know About Cash Flow... and 36 other Key Financial Measures- by Frank Gallinelli
Confessions of a Real Estate Entrepreneur- by James A Randel
The Millionaire Real Estate Investor- by Gary Keller
TRUMP Strategies for Real Estate- by George H. Ross
Irrational Exuberance- by Robert J. Shiller- This was written by a nobel-prize winning economist. He's 'predicted' the 2001 tech bubble, the 2008 crash, and this is his third edition with his 'predictions' for the future. I'm not saying he can tell the future, but he uses hard facts and illustrates his points beautifully on a number of different topics about the economy. Again, not exactly a real estate book... but a fantastic read to broaden your perspective.
That should hold you over for a little while... Keep me posted on what you think of the books!