19.3 Affiliate also agrees not to use any kind of technique that intercepts natural searches to redirect traffic through installed software, thereby causing commission-tracking cookies to be put in place or other commission tracking cookies to be overwritten where a user would under normal circumstances have arrived at the same destination through the results given by the natural search. (Natural search engines being, but not limited to, Google, MSN, Yahoo, Overture, AltaVista, Hotbot, LookSmart and similar search or directory engines)

As for where to place a disclosure, the guiding principle is that it has to be clear and conspicuous. The closer it is to your recommendation, the better. Putting disclosures in obscure places – for example, buried on an ABOUT US or GENERAL INFO page, behind a poorly labeled hyperlink or in a “terms of service” agreement – isn’t good enough. Neither is placing it below your review or below the link to the online retailer so readers would have to keep scrolling after they finish reading. Consumers should be able to notice the disclosure easily. They shouldn’t have to hunt for it.
At first I was reluctant to promote Amazon.com due to the poor cookie duration and low commissions. However, since Amazon has a huge inventory, it’s a trusted site, and you also get credit for sales customers make even though you weren’t necessarily promoting that specific product, it tends to make up for the negatives, so I have started promoting Amazon more. Great post btw!