That's the case in Southern California, where military families are beginning to take advantage of falling home prices.

NPR: Military Homebuyers Seize Opportunity In Calif.

Lots of gas and falling prices sent many rigs heading to oil-rich shales to take advantage of high prices for crude.

ECONOMIST: Shale gas is giving a big boost to America��s economy

It's not guaranteed that consumers would see all of that, though, because refiners, whose profits have been squeezed this year by high oil prices, might take advantage of the falling taxes to add a few cents for themselves.

NPR: 2 of 3 Presidential Hopefuls Back Gas Tax Holiday

Driven by falling turbine prices and the rush to take advantage of production tax credits (which were set to expire but were renewed by Congress in early January), wind energy was the fastest growing source of new electricity generation in the United States in 2012.

FORBES: With New Energy Fund, Obama Adds Fuel to Cleantech Engine