The market action today did some technical damage. As you can see from the chart below (provided by Stockcharts.com) a classic 'head and shoulder's' pattern appears to be forming in the S&P 500. If the market goes down much further the technicians may consider the pattern formed and they'll sell sell sell.
Overall it was an ugly day for risk assets with stocks, energy and base metals falling. The dollar, gold and US Treasuries were all positive. The quarter ends tomorrow so the exciting market action may be not be over with.