The US economy grew at a rate of 5.7% in the fourth quarter of 2009, according to  data released by The Bureau of Economic Analysis this morning.  That represents the highest quarterly growth in 6 years, and the growth was largely on improving inventory data.  From the BEA release: 

The increase in real GDP in the fourth quarter primarily reflected positive contributions from private inventory investment, exports, and personal consumption expenditures (PCE). Imports, which are a subtraction in the calculation of GDP, increased.

The acceleration in real GDP in the fourth quarter primarily reflected an acceleration in private inventory investment, a deceleration in imports, and an upturn in nonresidential fixed investment that were partly offset by decelerations in federal government spending and in PCE.

The Wall Street Journal's News Hub team--in this case Kelly Evans, Evan Newmark, and Dennis Berman--breaks down the data in their AM Report: