Looks like every search to me... http://search.yahoo.com/search?p=clothes&prssweb=Search&ei=UTF-8&fr=FP-tab-web-t&fl=0&x=wrt (13 sponsored links) http://search.yahoo.com/search?p=pets&prssweb=Search&ei=UTF-8&fr=FP-tab-web-t&fl=0&x=wrt (13 sponsored links) http://search.yahoo.com/search?p=san+diego&prssweb=Search&ei=UTF-8&fr=FP-tab-web-t&fl=0&x=wrt (13 sponsored links) etc. etc. etc.
I cannot believe that people rely on Yahoo! for their web searches. Goes to show the power of advertising ...