It probably would be useful to list all the codes that are currently working as well (on a new account):
Promo Description
1043 Earn double the points/miles
1878 AMBASSADOR ACCELERATOR BONUS
1965 DELAYED FULFILMENT GLOBAL
2108 SC - Stay 3 nights, get 2,500 points
2619 Book Direct 2013
2656 WELCOME BACK BONUS
2670 1000 POINT GOLD BONUS OFFER
2777 STAY 2 NIGHTS GET 2500 POINTS PROMOTION, MAX 2 WINS
2785 ELITE MEMBER NEXT STAY BONUS
3784 Planes, Trains, and Automobiles
3825 ELITE MEMBER NEXT STAY BONUS
3919 Welcome Back 2013
3927 Business Stayers Earn More
4644 ANNIVERSARY BONUS OFFER
4648 NEW MEMBER BONUS PROMOTION
4709 1,000 BONUS POINTS FOR 60 DAYS
4777 5000 POINT PLATINUM BONUS OFFER
6601 CANADA STAY BONUS OFFER
7637 WEEKEND STAY BONUS