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Here's an example of a page that is not indexed by bing http://bit.ly/xlMY2l I notice only the third page of this article is indexed. Thank you!

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.

This is not blackhat, but definitely Panda food. Unless they have a very high authority domain I don't see this technique working for them well (or at all) in the future. Reference: http://googlewebmastercentral.blogspot.com/2011/05/more-guidance-on-building-high-quality.html "One other specific piece of guidance we've offered is that low-quality content on some parts of a website can impact the whole site’s rankings, and thus removing low quality pages, merging or improving the content of individual shallow pages into more useful pages, or moving low quality pages to a different domain could eventually help the rankings of your higher-quality content."