"The AdSense Code" is concise and very focused on the objective of revealing the proven online strategies to creating passive income with Google's* AdSense.
If you are starting a blog or web site for the purpose of cashing in on Google Adsense (Pay-Per-Click) -- there is no better primer. Although it's a couple years old now, it still is packed with good info and the essentials you will need to start down the path to profit.
Helpful, but advice is probably out of date. I mean, everyone follows these rules now and a lot of the examples seemed pretty easy to ignore, if only because they've become the "norm".
Although this book is targeted to people getting way more traffic than I'll ever get, it's got a lot of good suggestions. The typos are distracting, however.