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Yahoo loves high keyword density, kw in the meta title (high title density), kw in alt tags, meta tags, meta description, header tags, and outbound link text.
Then you also need off-page optimization - at least 40 inbound links, as many as possible with keywords in the anchor text.
We're dealing wit this problem by creating clusters of sites optimized specifically for Yahoo, using mainly Yahoo optimization criteria.
In terms of inbound links, web maps and anchor text I am finding a crossover.
For people that have clients and can only optimize 1 site, I don't know what to advise. It's a little bit tricky as optimizing for Yahoo could trip a Google OOP penalty. If I had this situation, to be safe, I would create a secondary site for Yahoo and optimize it differently. Obvioulsy this creates the problem of splitting the link pop as you need link pop to rank for both.
So I'm not sure..any ideas?