The Dow Jones industrial average reached 10,000 today for the first time since Oct. 7, 2008. The milestone, which triggered a whoop from the trading floor, was buoyed by surprisingly strong earnings reports from Intel and JPMorgan. The latter stoked the market's optimism as it handily beat Wall Street's expectations, reporting a profit of $3.59 billion for the July-September period. (More stock market stories.)