2007 marks the first year that extended dates for Daylight Saving Time (DST) will be implemented. In 2007, DST will begin the second Sunday in March (this year on March 11) and end on the first Sunday in November (this year on November 4).
This will affect travelers planning itineraries for March Break. Be sure to confirm your arrival/departures times for travel over the first few weeks the changes will be in effect. (On the plus side, the days will be longer for spring skiing!)
For details for Ontario (and other Canadian provinces adopting this change), see Ontario Ministry Attorney General; For the USA, see the California Energy Commission.
And you may want to check your own computer: For computers built before the 2005 legislation was enacted, check to see if you need a patch to change the auto-DST feature for your time settings. And confirm all business meetings, etc around this frame.
While I am at it, I may as well remind Spring travelers that, this year, Holy Week begins Sunday, April 1 and runs until Easter Monday, April 9. These are important dates and travel times in much of the world, including parts of Asia, so book early to get the best routings and hotels.