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I ran a test last year and I managed to rank extremely well in yahoo and in no time at all (top 5). Maybe just luck or just due to some strange yahoo algo working my way. What I did was get as many backlinks as possible, and to be honest quality wasn´t an issue. Backlinks from free advertisement sites, blogs, forums. Mostly free ad sites. I would also say 90% of links obtained were nofollow. Yahoo seems to like nofollow?
Recently I stopped this as the site became successful and due to my "Black Hat" link building techniques I was worried about picking up a ban from google. Since I have stopped this all the "free ad" building and all links have been removed and as a consiquence ranking has been lost in yahoo, which is now around the 30-50 mark for KW´s that used to rank 1. From a link building point of view I hope this helps.