The "O Antiphons" provide a wonderful source of meditation to help prepare us for the Nativity. Traditionally chanted before and after the Magnificat in Evening Prayer during the last week of Advent, they help connect Old Testament prophecy to the Messiah born in a manger. Listen first to this wonderful introduction by Ken Myers of Mars Hill Audio:
St. George the Martyr Sermon Podcast
This is the podcast from St. George the Martyr Anglican Church in Greenville, SC. You may find out more about the church here.