Be sure to check the website for your name: http://www.webflyer.com/netmiles/fr12d.htm

From Mileslink:

WIN 5,000 Frequent Flyer Miles A Day

This is the big one. It's your big chance to earn even more miles from us.
Starting on Sunday, December 13 WebFlyer sponsors the "12 Days 'til
Christmas" mileage giveaway where you can earn real frequent flyer miles.
Each day at noon (MST) until Christmas, we will be posting a new email
address on the NetMiles/12 Days 'til Christmas page of WebFlyer,
http://www.webflyer.com/netmiles/fr12d.htm . You must check that page each
day to see if your name is posted. If so, simply email us that day by noon
(MST) the next day and you will be awarded 5,000 frequent flyer miles in
the major frequent flyer program of your choice. These miles are in
conjunction with the highly regarded ClickRewards program that earns you
miles for your purchases on the Internet. If there is no winner that day,
we will post a new name the next day and carry over the miles. So, if 3
days go by without a winner, the next winner would receive 20,000 miles, a
nice bonus this holiday season. On selected days, we will be adding a
5,000-point bonus from the Marriott Rewards program, so check every day to
see if you really are a winner. Remember, you must email us (instructions
on the 12 Days 'til Christmas page) to qualify for your winnings.

Good luck!