We know there is mattcutts.com with his inside scoop to Google (for the most part). Are there any other blogs that point out some insight to Yahoo! or MSN SEO?
I think this guy Tim Mayer works for Yahoo! http://360.yahoo.com/profile-N8qaF5IzeqS.Nbzj3G9fxw-- Plus there is yahoo's search blog http://www.ysearchblog.com/