I had several domains (!) ranked 1-4 on bing... for supposed 2000 exact / month. does not gave 100 visitors a months.
their data is total bullshit. and in my country, not worth "optimizing" for. in fact, I even killed the projects.
however (!) 2009 EMD still work perfect on bing.
but why waste the time for 2% of traffic??
else, bing ads are great an 1/10 cheaper than google..
i usually test them there, roll them out on adwords later.
st. even bing allows ads, while adwords is stuck up on some rulez..