Amazon has now officially launched Clickriver.
Clickriver Ads is an advertising program that allows businesses to place sponsored links on Amazon.com, next to search results and on product detail pages.
This is currently a private beta and you need can apply for the beta by filling the form on the homepage.
I have never participated in any advertising program to promote my websites. Have you ever done so? Are you a member of Clickriver? What is your experience on the same?