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This is one of the core things you should definitely be doing when you're doing keyword research. I recently read a short study (I can't find it again, sorry!) that went through and looked at the relevance between Bing and Google keywords. It found that (at least for the terms used) Bing had more relevant suggestions to the product the study was done for. Might be worth to check out Bing if you feel like Google didn't provide what you think it should have and then run it through AdWords to check the Google inventory as well.
2 years ago on Use the Google Keyword Tool for Content Ideas