Chris Beasley, an old author here, has written up a very recently cited blog entry at SitePoint he named Amazon-Sense? In that entry, he explains that Amazon has contact him and other potential publishers to place Amazon contextual ads on their sites. They are reportedly offering $100 bonuses to those willing to try them out. Chris explains;
Consequently I do not know if they’re having much luck finding beta testers. For obvious reasons you cannot co-serve their ads with those from Adsense, so for testing you really need to find a high traffic site that is willing to forgo Adsense revenue. Originally their deadline for signing up for the beta was the 31st of January, then they called me last night, past the deadline, and asked me to join still (but I again turned them down because Adsense is just too profitable for me, and with Adsense’s exclusivity requirements I’d have to forgo using them to be in this test). They also previously offered a $50 bonus for everyone who signs up, and that bonus is now $100.
What is interesting, is that I was unable to find threads on the topic at WebmasterWorld and Search Engine Watch. So I started one yesterday at Search Engine Roundtable Forums.