I figure I'll just put it up late tomorrow, so you have until noon (Pacific time) tomorrow to vote! I'll just count the votes I have so far and then add in the late additions tomorrow before I reveal the choices!
You vote by sending your top ten choices to firstname.lastname@example.org (make the subject heading clear that it is about The Greatest Christmas Stories Ever Told Voting) by that time (you send your votes by e-mail, not in the comments to this piece). If you legitimately don't think you can think of ten stories, I'll still allow the ballot if you can think of at least six stories.
Please use your best judgment on what qualifies as a Christmas comic book story, but I think that it's likely pretty evident. One note - for holiday anthologies, vote for the individual stories within the anthology not the anthology itself (so don't vote for the 1991 Marvel Holiday Special or whatever).