It was a Sunday.
Christmas Day will be on a Sunday in 2011.
Christmas (the 25th December 2011) will be a Sunday.
Sunday
New Year's Day is one week after Christmas Day.
In the year 2030 December 25th (Christmas) will be a Wednesday.
Christmas was on a Sunday in 2011.
Christmas Day is great no matter what day of the week it falls on. When it is Christmas Day the day is completely different to any normal day of the week, so whatever day it is doesn't really matter.
Christmas Day 2010 is a Saturday.
Christmas Day will be on a Friday in 2020.
Christmas Day in 1981 was a Friday.
Christmas Day in 1940 was a Wednesday.
Christmas Day will be on a Wednesday in 2013.