Did you see the huge volume at 4pm on the big caps? (IBM,MSFT,INTC,DELL,CSCO,etc) Looks like a fund dumped some big blocks eod.
They didn't want to show they owned so much of these bellweathers? I find that hard to believe. Maybe a fund dipped too far into their cash level for the month and had to dump to get back to their stated minimum. Or maybe I'm just too cynical these days.
In edit: Or maybe it was Putnam selling. Wow this could get out of control.