There's no doubt that one of the biggest drivers of current market action is oil. The continued volatility in "black gold" has led to steep price declines in many of the stocks that rely on it, or products made from it. However, as bad as it's been for the energy sector, weakness in two other places in the markets is grabbing more attention ... technology and financials.
It may seem obvious to many, but it's worth repeating why these two parts of the stock market are so much more important than others. They represent the two biggest sectors in the large-cap index.