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Skeptic - 3:43 pm on Jul 7, 2007 (gmt 0)
The site you found is probably inserting YPN into search results with PHP or another dynamic implementation. [edited by: Skeptic at 3:44 pm (utc) on July 7, 2007]
As far as I know, Yahoo does not offer YPN for Search like Google does (Adsense for Search).