Most of us know that Amazon is a great place to do trends research: seeing what's selling well is a great way to mine for affiliate or info product opps. But if you're researching an article, blog post, or info product you can drill much deeper by actually reading parts of the book online! Do a search for "dog training" or whatever and look for a link called Excerpt. You'll then be launched into a special reader that offers (variously) random pages, front matter, and index--all of which can be gold for the information prospector. Understandably they don't allow copy and paste. Just jot down relevant information into a text editor or Google Docs. It has the fringe benefit of helping you learn the material better.