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Receptional_Andy - 12:14 pm on Dec 5, 2008 (gmt 0)
It's impossible to know which words and phrases resulted in your content getting an impression in the SERPs - only Google know that (they provide scant data about it in WMT). Your web analytics will tell you whether keyword-targeting is successful, and if you are targeting particular words and phrases you should be checking the SERPs themselves.