According to Andy Baio, Yahoo appears to be testing out a contextual ad program for small websites, like Google's AdSense:

Ken Rudman is a product manager at Yahoo-owned Overture, and his blog features contextual Overture ads throughout. His homepage shows the vertical two-ad format, monthly archives show a three-ad horizontal format, and individual entries show another variation of the horizontal format. The ads have decent relevancy, especially considering its early state.

The Javascript that generates the ad IFrame is hosted on Overture's server: http://ypn-js.overture.com/partner/js/ypn.js. The domain name refers to "ypn," which might be an acronym for the ad program... Yahoo Publishing Network, maybe?

What do you think of that? Phil Ringnalda found them awful.

10two.com blog points out that these ads look like Content Match. But Content Match is served from cmhtml.overture.com, whereas these new ads are served from ypn.overture.com...

Via and John Batelle