There are a number of “e-books” available on the Web with
more detailed or advanced information about AdSense. The two
most popular (and from what others have told me, the most
credible) e-books are:

• Joel Comm's Google AdSense Secrets
• William Charlwood's The Definitive Guide to Google AdSense

Compared to Make Easy Money with Google (MEMWG), these e-books are
not cheap, but they're also aimed at a different audience. I know some of the reviews up on Amazon.com were expecting more “secrets” from MEMWG than what they got, but they probably bought the wrong book. (Aside: I would actually argue that there are no “AdSense secrets” anyhow, just hints and tips derived from experience, pretty much everything about AdSense can be derived directly or indirectly from the AdSense formula.) I'll leave it up to you to decide if they're worth buying or not, I can't really comment either way.

Peachpit Press, publisher of my book Make Easy Money with Google, has just made Chapter 3 of the book available for free on their website. Titled Finding Something to Say, the chapter talks about:

• why people create blogs and websites
• how to find a topic to talk about, including a discussion about high-paying keywords
• how to gather content

You'll enjoy the discussion of the “Four F's” of publishing on the Web: fame, fortune, philanthropy, and fun. The chapter Finding Something to Say should give you a good feel for what my AdSense book is all about.

One of the problems that AdSense publishers face is getting Google's crawlers to concentrate on the “right” part of a page in order to choose relevant advertisements. Things like navigation bars can sometimes throw off the relevancy, requiring layout tricks (typically using CSS to “push” the real content up to the top of the page when read by a browser) to ensure that the right ads are chosen. As it happens, Google's new content marking feature makes it easy to tell the AdSense crawler what parts of a page it should concentrate on. This is going to be a boon for pretty much every publisher, and it's really easy to implement — just add a couple of HTML comments to your page and you can immediately highlight the real content. You can also use the feature to hide content from the crawler without affecting the HTML. Check it out!