The United States Postal Service has published their shipping & mailing schedule for the 2012 holiday season. https://www.usps.com/shippingdates/
I won't be listing those dates in my shops because I don't want any customers to get the mistaken impression that orders received by those dates would be guaranteed to arrive by a specific holiday. I only wish that the postal service was that reliable and that the customs offices around the world never delay any packages! But, it's good to have that link bookmarked as a reference once the last minute shoppers start sending us convos.