I send out Christmas cards, yearly. When I have time, I do an illustration. When I don't have time, they become... New Year's cards, or even Valentine's Day cards. I have lots of reasons for sending them, many of which have changed as the years go by. At this point in my life, having reliably updated mailing for my friends and the people I care about are definitely a big part of it. An "Addressee Unknown/Returned to Sender" rubber-stamped envelope is a pretty good way to be sure you've lost track of someone you once had much love for!
This year, with our late (U.S.) Thanksgiving, I am doomed. Lots of New Year's cards, for sure.