Recently, I read a pretty interesting book 'Rich Dad, Poor Dad' by Robert Kiyosaki's and Sharon Lechter. It's not really just about investment, per se, but one that advocates financial independence through investing.
The book touches on the fact that most people lacks finance accounting knowledge and understanding. This has led to many people running into cash flow problems, because they don't understand the differences between Income, Expenses, Assets and liabilities. It's simple, buy more assets that bring up cash flows (e.g. real assets), cut down on liabilities (e.g. car loans), as long as your assets' cashflows can cover your expenses, your are considered wealthy!