A large minority of this $ probably came from panic sellers during the 2 dips last week and this week.  So this stat might not be bullish in the short term (a week or so) since these bids are unlikely to move above their sell price easily.  But other stats indicate a lot of new $ is still pouring in.  When this causes the market to regain momentum, all these sellers will have to hop back on board or be left behind.  So my prediction is when the market shows a good uptrend (52-55), its gonna really pop!