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Any help would be appreciated.
[edited by: Receptional_Andy at 2:41 pm (utc) on Jan. 6, 2010]
[edit reason] No specific keywords, see charter [/edit]
There was a fairly lengthy discussion of this report a few weeks back which may be of use:
New - Keyword "Significance" in Webmaster Tools [webmasterworld.com]
Personally, I think the data provided is insignificant - although others disagree, of course.
Certainly, there seems to be post-processing applied to the data in a way that is not applied to the organic search algorithm, which may be what causing the effect you're seeing.