I think the best thing about having The Portable Dad for sale on Amazon.com is the "frequently bought with" and "other customers also bought" features. For a while, my book was frequently bought with Steve Harvey's new book, but now it's paired with the more logical How Your House Works.
For a couple of months, the recommendation Amazon gave through the "other customers" feature was Santa Claus 3: The Escape Claus. Now, I don't have anything against Tim Allen - who after all did star in a show called Home Improvement - but seriously folks, a little finesse in the algorithms goes a long way.
Today that's all changed. Other customers are now buying Muay Thai, jiu jitsu, and MMA training guides. Not sure what it means, but I like it!