Via ResourceShelf.

A New Beta from Amazon.com: ClickRiver, Pay-Per-Click Ads
https://clickriver.com/

Clickriver Ads is an advertising program — currently in beta — that allows businesses to place sponsored links on Amazon.com®, next to search results and on product detail pages. Clickriver Ads presents a unique opportunity to advertise services and products that complement the selection on Amazon.com, an online marketplace with tens of millions of active customer accounts.

   Clickriver Ads was created by A9.com®, a search technologies company based in Palo Alto, California. A9.com is a wholly owned subsidiary of Amazon.com.

It’s a closed beta at the moment. Apps accepted.

Source: A9