Margaret Barker's new book, Christmas, the Original Story (SPCK Publishing, 2008, ISBN 0281060509), examines nativity traditions with an eye to temple theology. It has been available in England for over a month. However, I have not been able to find it available on any of the standard internet book dealers in the US.
For those of you who just can't wait 'til Christmas, it can be purchased from England via ABE Books
Then UK book distributor "TheBookCom" sells new copies for $11.81, with $10.33 for international shipping, which is about what you'd pay buying a new copy in the US given the exchange rate.
If anyone knows if the book is available in the US, let us know.