Ive got some general tips in an article i made its in my sig, but im not sure of any specific yahoo tips. I have heard they really like good quality back links though
On a wordpress blog if you add the xml-sitemap it has this area Notify YAHOO about updates of your Blog Your Application ID: How much does that help with Yahoo?
Really? That's interesting. I thought Google was the one all about backlinks. I don't really get Yahoo personally. It's hard to figure out how to optimize for a search engine when most sites in the top 10 are spam. One thing I did notice is that Yahoo gives a lot of love to pages from sites like Squidoo. Yahoo returns some Squidoo pages in the top 10 even after it has been blocked for spamming many months ago. Maybe there is something to learn from that.
There is opposite for yahoo and google. When keywords rank in google, at the same time its not show in yahoo. Yahoo, more weight on quality content instead of link.