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[edited by: tedster at 4:54 am (utc) on Apr 1, 2012]
Or (possibly) this is now normality...the top 20 results (say) get rolled round in some way
Maybe this is the reason for such huge fluctuations in the SERPs...rolling out the changes one bit at a time on different servers in a rotational movement.
After over 10 years of consistently ranking between position #1 and #3 on page one for a single four letter word search term, the month of March (starting on the 10th) has resulted in falling to below the fold, then to page 2, then page 3 and today I have been completely removed for that term.
This March / April update has been quite a rollercoaster...