yep, I know about that. Got a phone call at midnight noting that our 6 am flight was cancelled and would we like to be booked on the flight for the next day/
Yessiree, and after contacting our hotel out of the country, had to deal with extending our return flight a day so we would not miss out on a day in the sun. (this is important for us in New England who 'enjoyed' a cold winter this past season).
See some interesting facts from the Bureau of Transportation Statistics.