Honestly I wish I could answer this question, Yahoo seems to be the only SE I can never figure out. One update I'm #1, next update, I'm on page 2-4. It would be nice to see more input about optimization for Yahoo but with the amount of traffic it produces even when our sites are owning specific keywords the traffic is not even 1/20th of the traffic by Google. And now Bing is the #2 referrer for every single site we have and by a staggering percentage (which is rapidly gaining on Google). In any event, it would be nice to see some optimization tips pinned to this forum.