So every year I get asked what IS Boxing Day and I've told a story that has been ratified by Wikipedia, from which I quote...
In feudal times, Christmas was a reason for a gathering of extended families. All the serfs would gather their families in the manor of their lord, which makes it easier for the lord of the estate to hand out annual stipends to the serfs. After all the Christmas parties on December 25, the lord of the estate would give practical goods such as cloth, grains, and tools to the serfs who lived on his land. Each family would get a box full of such goods the day after Christmas. Under this explanation, there was nothing voluntary about this transaction; the lord of the manor was obligated to supply these goods. Because of the boxes being given out, the day was called Boxing Day.

So it's a class thing, and in deference to the poor, the Royal Family still don't open their pressies until today!! It always seemed like a good idea to me, when I was young we could visit one grandparents on Christmas Day and then the next on Boxing Day and years later, when my parents had split up, it helped in dealing with the pressure of being in both homes every year for at least part of the holiday!

Hope you had fun with your family and friends, we'll be back in the regular formation tomorrow, Danny is sitting in for me tonight.