Matt Krantz clearly explains how to start investing online, but also provides many of the basic terms investors need to know. He explains the differences between the many types of investments (stocks, bonds, ETFs, mutual funds, and even junk bonds/penny stocks). Although he periodically sneaks in what I consider to be the best advice -- invest in index funds -- he continues with many other investing ideas, even making stock screening look very tempting. If there's any complaint, it's that he sometimes goes a little off-track by introducing an "online" topic (RSS feeds, podcasts, etc) and then takes a few pages to explain how to access those various tools. Also, since I'm reading the book three years after it was published, some of the links have died, which is to be expected. Even if you're a passive investor, it's an interesting book to see what you're missing.
[This reviews the 7th edition, published in 2010.]

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LT Haiku:

How to make money?
Charts, math, and Internet sites
That give you ideas. ( )