Excellent question...

I've read the book and I am at a loss for ideas of what would work well.

Tim (the author) and his example in the book (forget his name) both have businesses that sell some kind of product.

Tim spoke of information being a great product to sell as something as an e-book or similar has great profit margins with little to have in place to sell it.

I'm not sure how I feel about selling e-books, but I like the idea of building up a blog and using AdSense to monetize it. I realize this is slow going at first, but with correctly applied effort over time this seems to be a way to go that is fruitful...

With articles written and archived, you could potentially reap benefits from them years after you first posted them.

Also, the blog could get your name out there as far as being an expert in an area and that could lead to speaking enagagements and book writings...etc.

One could look to Merlin or other well-known bloggers out today.

A blog seems a way to build up the writing experience to lead into a book or e-book maybe...

The other approach would be to sell some type of product such as software or physical product like Tim's example in the book of the guy who sells audio packages(?) by providing a store and selling the product of someone else...

Forgive me, I don't have the book in front of me for the details...