How Important is Apple? ($AAPL)

How important is Apple ($AAPL) to the indexes?

• The SP500 was up 18.72 points. About 5 points of that was Apple
  
• The Nasdaq was up 2.7% today. Apple was responsible for about 59% of that.

From the WSJ: The stock is now large enough to singlehandedly sway the major U.S. stock indexes.

Of course, we all know this, as we're reading the WSJ and blogs on our iPhones and iPads.