Becoming a billionaire shouldn't really be a goal as much as acquiring wealth. The best book I could recommend along that line is "Rich Dad, Poor Dad," by Robert T. Kiyosaki
http://www.amazon.com/Rich-Dad-Poor-Money-That-Middle/dp/044656740X/ref=sr_1_1?s=books&ie=UTF8&qid=1293937751&sr=1-1