4 good collections of links and resources for your perusal:
Jonny Baker, including beach hut advent calendars, advent tweets, videos, art etc.
Christine Sine, always excellent, lots of good Advent resources, meditations, poems, videos
Internet Evangelism Day, all sorts of bits and bobs, including the splendid Beatbox Nativity
Evangelical Alliance has a compliation of Christmas quotes, research and statistics, including how much people plan to spend, attitudes to Christmas cards, including one survey which has the majority of respondents declaring that Christmas is overrated, primarily for children, and that Jesus is irrelevant to how they spend it. Also surveys on mental health, debt, and a startling mince pie.