There are a couple of online Advent Calendars I've discovered. One is from the CoE and is found here. The introduction, at least, features the Archbishop of Canterbury in a video clip. The RC parish of St. Margaret Mary in Napersville, IL, has one here. This calendar is also available by clicking the Advent Wreath on the blog.
Evensong from the BBC is here, sung by the Lay Clerkes of Newcastle Cathedral.