More Search Products Prowl for Market Share The initial performance of two Web-query services launched last week, Accoona and Blingo, suggests market leaders Google and Yahoo don't have reason to worry yet.&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/b&gt;&lt;/font&gt;