Mary Katharine Ham explores how we arrived at The Holiday That Dare Not Speak its Name:

James Lileks' Bleat from a couple of Christmases (oh no, he said it!) back is also worth reading for its historical perspective, as he rummaged through his newspaper's Christmas (he did it again!) archives over the course of the 20th century.

Update: It sounds like St. Albans, North Carolina has a particularly impressive Leftivus display this time of year.