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Also, were you one of the ones showing the "data not found" problem a couple of days ago? I wonder if it could be related, since at that time some showed regular stats, while others had that error.
This might be stupid but theoretically possible, right? And it might be interesting for Google if compared to total page loads in comparison?!? If I was Google, I wanted to take this qualitative equation...
I'll go with the page not fully loaded theory. Depending on page structure this can be more or less relevant. If you do a 2 or 3 column layout with the bulk of info on the left and adsense on the right, you would be more likely to have less adsense impressions than pageviews.
This theory is easy enough to test, just put a simple page counter directly below the adsense.
For example, if you have the Adsense code in one page and it shows four ads, is this one ad impression or four?