I know what I need to do to rank on Google (links) and Yahoo (keyword rich content), but I don't get Bing yet. For most of my keywords and websites my Bing rankings are close to my Google rankings, but other times they are completely behind. I have to admit that I have never even bothered to read the Bing webmaster tools help (if that exists), but now I want to start learning how it works. Is there any good source of information about Bing? Any ebook, course, blog or something else that's worth reading?