From Reuters:

The Dow Jones industrial average crossed the psychologically important 10,000 number for the first time since one year ago as investors reacted to strong reports from JPMorgan Chase & Co and Intel Corp.
The 10,000 figure is seen by some as a sign that the market’s recovery may endure. The Dow is now nearly 55 percent higher than the 12-year-low of 6469.95 hit on March 6, but remains more than 12 percent from its pre-Lehman Brothers bankruptcy close on September 12, 2008.