Browsing an e-commerce web site reveals a lot about your interests and intentions. If the site owner can’t get you to buy something, maybe they can hand you over to another advertiser. I didn’t have to browse for long on the Home Depot web site before I found a General Motors ad. (See right.) Although I can see the connection between a business radio and a pickup truck in which to carry it, the possibility of advertising more complementary and add-on products sounds very attractive for both profit and for the consumer experience.

ClickZ News: Amazon.com Launches Self-Serve Ad Beta, 2006-Nov-3, by Ryan Naraine

…"[We are] beta testing an advertising program that allows businesses to buy sponsored links that appear on Amazon.com, next to search results and on product detail pages," the [Amazon] spokesman said in an e-mail exchange with ClickZ News.
"These ads will feature products and services that complement products sold on Amazon.com. …"