Looking today at week-over-week shares outstanding changes among the universe of ETFs covered at ETF Channel, one standout is the Vanguard S&P 500 ETF (AMEX: VOO) where we have detected an approximate $113.2 million dollar inflow ? that?s a 4.0% increase week over week in outstanding units (from 44,244,749 to 46,002,439). Among the largest underlying ...