I'm not too sure how to rank on Bing, I'm asking the same as well. I had a personal view why there is a need to rank in Bing.
I recently been to a customer's office and I realise that most of the computers (dell) that they brought had the default homepage set to MSN and uses bing as search engine.
For IT savvy people that's not a problem at all, for people who are older and younger (beginner in using PC) stand a good chance adapt to using Bing. Chances are Bing might open an opportunity where their users are newbies and freshies that might be good for adsense or affiliates.
But as of now, my experience with Bing is far from being statisfied - just my two cent 
|