DST in 2007

Next year, daylight savings time starts earlier and ends later. Which got me wondering a couple of things:

1) Who decides this? Is there a DST committee? If so, what do they do most of the time? If not, who has the right to mess with our clocks?

2) How exactly did the discussion come up? "You know what would be fun? You know how people are always struggling with the time change? ‘Is it the first Sunday in April or the last Saturday in March? Do we go ahead an hour in spring or is that in fall?’ Well, let’s mess them up even MORE! Any ideas?"