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As a side note, yes, I should be doing things other than watching AdSense all day like an addict :D
Occassionally the system seems to lag a bit and skips a beat.
I have MRTG plotting nice graphs - you can easilly identify update intervals from the staircase pattern, any points where the stats get stuck, yearly trends, etc. Shame I can't post an example due to the no links policy.
However there is also a problem with the above method, sometimes the stats dont change for hours, thats a serverside issue on google's behalf.