phranque - 9:35 am on Jun 25, 2010 (gmt 0)

How to Improve the Position of Your Website in Yahoo! Search Results | Yahoo! Search Help:
http://help.yahoo.com/l/us/yahoo/search/indexing/ranking-02.html [help.yahoo.com]

Use a "keyword" metatag to list keywords for each page of your website. Use distinct lists of keywords that relate to each specific page on the site. Do not use one broad set of keywords for the entire site.

(last updated february, 2010)
for what it's worth...