Thanks to Congress, the U.S. "sprang forward" three weeks early this year, and daylight savings time will last one week longer in the fall. The idea behind the switch is energy conservation.
But as reported here in January, two ARE researchers, doctoral students Ryan Kellogg and Hendrik Wolff, found that a similar switch in Australia didn't meet the mark. Now that the the bleary-eyed mornings and brighter evenings are upon us, their work is getting a lot more attention:
Daylight Savings Might Not Save Energy (Video - ABC News)
Does daylight-saving time really save energy? (ScienceBlogs)
Daylight Savings Time: Energy Dud? (Discovery Channel News)