On a very practical level, the change in Daylight Saving Time will affect the most people:
Beginning in 2007, DST will start on the second Sunday in March (March 11, 2007), and change back to standard time on the first Sunday in November (November 4, 2007). Under Section 110 of the Energy Policy Act of 2005, the U.S. Department of Energy is required to study the impact of the DST extension no later than nine months after the change takes effect. Congress has retained the right to revert to the DST schedule set in 1986 if it cannot be shown that there are significant energy savings from an extension of DST or if the extension may prove to be unpopular with the American public. One potential issue is that some northern regions on the western edge of time zones will for the first time since the 1974-75 "almost year round" DST experiment have sunrise times that occur after 8am.
If I were a betting man, I'd guess that there will be a lot of calendars (paper and electronic) that will NOT reflect the change.
Another thing that interested me is the introduction of The Presidential $1 Coin Program, inspired, no doubt, by the success of the state quarters. Four Presidents will be represented in 2007:
I'm looking forward to the Millard Fillmore coin in 2010, myself. Incidentally, the death of Gerald Ford last month makes him eligible in 2016, whereas Jimmy Carter, at this writing, is not. Nor are the Bushes or Bill Clinton yet eligible for 2017.