Amex Platinum or Centurion cardmembers can get one night free at either the Wynn or Encore in Las Vegas, with a minimum 2 night stay:

Stay between Jan 15th and ends June 30th, 2010. First complimentary night free with a 2 night minimum. (essentially buy one, get 1 night free)

MENTION Promo Code: E1320542 (this is not bookable on the new FHR website, must phone in)

Bookings must be made by April 15, 2010. In addition, the promo is valid for only one room per cardmember. (Via FT)