A WebmasterWorld thread points to a comment by Bing's Senior Product Manager, Duane Forrester, who said just like Yahoo in the past, Bing does use the meta keywords tag for ranking purposes.
Duane made sure to explain that it won't make a huge difference in rankings. Duane said:
I'll make this statement: meta keywords is a signal. One of roughly a thousand we analyze.Getting it right is a nice perk for us, but won't rock your world. Abusing meta keywords can hurt you.
We know Google currently does not use it but don't confuse it with the meta description tag which they do use.
That being said, will you spend the time manually or even programmatically adding in meta keywords into your pages, knowing Bing uses them and Google does not?
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Forum discussion at WebmasterWorld.