Do you want to know how much to bid for the best placement of your ads on Yahoo's Overture? According to the December 27 issue of Forbes, the top bids for a click-through include: For mesothelioma it's $160 and for Vioxx it's $15.03. And it's only ten cents for a listing for "clergy abuse."
You can go on Yahoo's site to find out how much you need to bid to get the best listing position there. Unfortunately, Google doesn't have the same transparency to determine how much you need to pay for a top listing on its site.
You can also go to Yahoo for an overview of its click-through services, including its Precision Match, Local Match, Content Match and Site Match.
Danny Sullivan, on his SearchEngineWatch has a series of in-depth articles on how sites can utilize search engines. One of those articles is "Submitting Via Paid Listings: Overture & Google AdWords."