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jeremy_goodrich - 9:28 pm on Jun 16, 2003 (gmt 0)
As far as I know, they simply randomize them...which, imho, makes for a terrible surfing experience. Though perhaps if you pay $$$, you get stable spots in the SERP's?
I've noticed they drop pages without warning, and that even while watching the results via the 'pure search' at Position Tech, you can f5 your way to different, rotating results.