NEW YORK (Fortune) -- The economic storm pelting the U.S. economy is going to do plenty more damage to already flattened job and housing markets.

But as dark as the next three or four quarters could be, the U.S. economy appears to be undergoing a more lasting, and ultimately uplifting, shift.

Americans who for decades have spent an increasing share of their incomes and taken on more and more debt are now, for the first time in years, saving instead.

The personal savings rate, which measures the amount of disposable personal income that isn't spent, ticked up to almost 3% in the second quarter of 2008, after almost four years below 1%.