I tested a selling a database via adwords as suggested in the book, and I got a decent enough response that I'm outsourcing the the database development in the next few weeks. It's not going to make tons of money, but it might make $300-1000 a month in passive income. That's worth the effort for me.
His sections on time management don't translate extremely well to developers, but focusing your time very narrowly on what's essential and most productive makes a lot of sense.
Yes, there's a tone of self aggrandizement throughout the book that can get annoying. But there's a lot of really helpful ideas which are worth the read.
... or worth summarizing:-)
edit: the chapter on virtual assistants was also interesting, but if I recall, he didn't write that chapter.