One of my favorite investing books in which I highly recommend is The Coffeehouse Investor by Bill Schultheis. Mr. Schultheis was a broker for Smith Barney of 13 years until he decided enough was enough and opened his own money management firm Pacific Asset Management. He claims he couldn't take the stock picks, upgrades/downgrades and sell side analysis anymore so he focused his firm on asset allocation by way of index funds.

Warning: this book may be too boring for some, but it works....