What are the factors that really effects the Yahoo SERP's? And I am not talking about quality backlinks.
Quality and uniqueness of the content along with relevance.
According to me. To get in yahoo SERP's you must focus on creating very good content along with quality backlinks.
What I have noticed in the search results of Yahoo is they have similarities with Google and Yahoo is more on exact keyword results.
Backlinks are all you need to rank in Yahoo