A Hubble Advent Calendar?
Cool.
So Boston.com has a Hubble Advent Calendar.
Damn, I wish I had thought of that.
STSCI, as before, has Hubble Seasonal Greeting Cards, free, for you to print out old style, or to send electronically.
and, for the classically minded, there is the BBC's A Bach Christmas Advent Calendar
More like this
You are in a maze of twisty little passages, all alike.
The New Humanist blog is running an advent calendar podcast, in which various people are asked what scientist they'd like to have
On Uncertain Principles, Chad Orzel counts up toward the birthday of that most holy of men: Sir Isaac Newton.
How about a Chandra Icelandic Winter-Solstice Elves Advent Calendar?
Don't forget the planetary advent calendar:
http://planetary.org/blog/article/00002238/