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Ok, found it again.

The original tool I meant was "RamMap" from Sysinternals. This one can do a lot more than just flushing the read cache (aka "stand by list") of windows, but it is a graphical tool without a command line interface.

Someone has just put the code to flush the stand by list into a small command line tool here: http://www.mediafire.com/download/epo2qh9s1ic4q6f/EmptyStandbyList.zip

Will try whether that helps making the results more consistent...