I think theres a complete lack of info on ranking in yahoo... Everyone is focusing on google, can they always say... SEO for google and yahoo will follow, which i do not find to always be the case
yahoo ranking is simple if u have done good onsite optimization with well keyword optimization, including content
yahoo site maps can be added using website explorer. you can open it by searching for site:yourdomain.com on yahoo search.
I don't think you can do much for optimizing website for yahoo except Meta, Title and huge backlinks, and keyword rich domain will do rest of job.
Its really very hard to get ranking on yahoo, Does yahoo ranking is only based upon the linking rather than content.