AMEX gives $20 for spending $40 at Walmart twice from Nov 18 through Dec 18, 2008

For folks in US who shops at Walmart and have AMEX credit cards.
To participate in this program enroll your AMEX Card details. Then visit any Walmart store or walmart.com and use your registered American Express Card. $20 savings will automatically be credited to your statement within 5 days after you spend $40 or more 2 times from November 18 through December 18, 2008.