I enthusiastically endorse http://www.Booklinker.net. It’s a great service for authors with books on Amazon.com because it creates links that automatically redirect to the appropriate website.
Here’s how I’ve implemented it on http://www.Monbed.com:
So, why would I do this? Well, I want them to make money, but I also want my readers in the USA not to have to face an advertisement, benign as it may be, when they place an order, and I also give up the small 4% commission that I get when someone clicks on my widget directly. Now, that may not sound like a lot, but I have eight years and over $20,000 invested in this series of books if you go back to the CD/booklet version and count all of the direct costs associated with the production and marketing of the various books. So, I’m being frugal.
Also, there’s one other reason. I expect Bookliner.net to succeed, but suppose they don’t, or suppose that are hacked. What happens then if all of my links are dependent upon them. Bad news, and I can visualize it happening on a day when hundreds or thousands of orders are being placed. (Murphy’s Law.)
I urge you to implement this service. I truly want them to succeed. Implement it with discretion.