There are other ways to earn from your blog. For example, you could sell banner advertising. You could survey-based cost per action -- CPA -- ads (you're paid when users fill out a survey or complete some other action). You could sell video ads. Yo and I are launching FreelanceTheater.com soon, and we might eventually sell jingle ads or other audio ads in the audio plays there. Get creative and brainstorm some possible income streams for your blog that would work with your niche. There's a reason you won't see a lot of banner ads or even contextual ads here at AFW. Years of testing told me that they weren't the best ways to monetize a site targeting freelance writers. That testing also demonstrated that far better options were to incorporate job lead based income streams and promoting my own products for sale here. Don't simply assume the easiest option will be the right one for you.
While I don’t have any direct experience with it, I know it can be quite profitable, especially in niches where you have high profit margins and low shipping costs. Vitamins and cosmetics, for example, are two popular drop shipping industries. Anyone can theoretically start a “store” and have dozens or even hundreds of products to offer within a matter of days.
PPS oh you thought I was done did you?! The other parts of the book, although not truly passive income generation focused, are amazing too. I know things like the low information diet and killing interruptions have made a huge difference to my success – and if I can try and get a little more consistency in my adherence to them, then happy freaking days!