You may want to add Andrew Bourland's blog to your list of “must-read” blogs. The blog's title is “A Closer Look at 'Get Rich Quick' eBooks”. Andrew is going to look at the various (mostly AdSense-based) “get rich quick” e-books (I still prefer the hyphen) that generate a lot of hype. See Andrew's introduction for the explanation of what he's doing and about his background, and for an interesting quote from “The Rich Jerk” system. First up in his sights, though, is the “AdSense Gold” system. I'm definitely going to keep an eye on this blog. I must admit to being curious myself to what these people are actually promoting, because I do think I know a bit about the subject at hand and I can't see most of these doing anything but promoting spammy website/blog creation. In other words (as I wrote recently in How to make a fortune with AdSense) basically you create umpteen websites/blogs stuffed with keyword-rich content that ranks decently for well-paying keywords and make your money on sheer volume. But I just can't get myself to spend the money to buy these books to find out what they're specifically saying… Luckily, it looks like Andrew's going to do the research for me!
Actually, Andrew didn't mention one of the other ways these e-books make money, which is the inclusion of affiliate links in the text to “recommended” books and software. I'm thinking that must be a great source of income, given the typical payout on those programs. Check out this ClickBank page that shows the payouts for the top-ranked “Marketing and Ads” products available for sale by ClickBank affiliates. The affiliate payouts range from $20 to $50, so it only takes a few sales to make some good money.
Don't expect Andrew to review Make Easy Money with Google, because it doesn't fit either of his criteria: it's not a “get rich quick” book and it's not an e-book. Perhaps I was stupid not to publish it as an e-book, but I think I'm also able to reach many more people in my target audience by having it come out as a conventional book. And no, there are no affiliate links in it, they'd be kind of hard to click! 
P.S.: The long-delayed AdSense case study is about to restart. I had a bit of a hiccup there doing all the groundwork for my new AdSense newsletter and related mailing lists. I'll be writing about all that stuff later, too, once things settle down.
Eric Giguere is the author of Make Easy Money with Google, a real (printed!) introductory AdSense book for non-technical people, available at all fine bookstores. For more information, subscribe to his AdSense newsletter and get a free bonus AdSense traffic tip just for subscribing. Or add the book directly to your Amazon shopping cart for easy ordering!