Amex is running another double Membership Rewards points promo targeted towards its Business card holders from November 1, 2006 through January 31, 2007. However, instead of earning double points on all purchases, you’ll only earn double points on your monthly spending above the amount of your October 2006 spending:

For example, if you spend $1,000 in October, $1,200 in November, $1,500 in December and $800 in January, the positive difference in your spending would be $700 and you would earn 700 bonus points in addition to the 3,500 regular points you would have earned for your spending from November through January.

In addition, when you register for this promotion, you’re automatically entered into a sweepstakes with a Grand Prize of a $100,000 statement credit. There are also four first prizes of a $10,000 statement credit and 2,000 second prizes of a $25 Starbucks gift card.

You can register for this promo either online at www.open.com/sweeps or by calling 1-866-537-1397.