Can you recommend a few resources for Yahoo SEO

[AEM13]

We get very little traffic from Yahoo Search and it seems only 15%-20% of our pages are indexed by Yahoo and Bing although we do submit sitemaps to both of them. Do you have some tips or resources (articles, blogs, books) you could recommend for Yahoo Search optimization?

[KrisRoadruck]

You'll want to focus on Bing rather than yahoo. Yahoo has its search results provided by Bing. In general bing has a pretty marginal market share. They also have a much smaller index. One that is refreshed far less frequently than Google. What you are seeing is about par for the course at the moment.