From freeshippingday.com :
What is Free Shipping Day?
Thursday, December 18th, 2008 is Free Shipping Day. It's a day when participating merchants give free shipping to online shoppers with guaranteed delivery by Christmas Eve.
Free Shipping Day is the last chance for many procrastinators.
How can I find out what merchants are participating?
This is the first annual Free Shipping Day, and more and more merchants are signing up every day. Check out our home page for a list of participating merchants. You can visit our deadlines page for a list of holiday shipping deadlines for over 250 merchants.
So hurry on over and finish out your Christmas shopping! And don't forget to shop through a cashback website; you might as well earn a little money back on things you'd be buying anyway. (I've been shopping through Cashbaq for my personal online purchases, and I've gotten some great deals!)