For those of you that think Amex doesn't like cardholders to use their card for everyday expenses, this should dispel that notion.
I just logged onto my Amex account (Amex Gold Rewards) and found the following offer:
Now through March 15, 2010, make every trip to the store or the pump count twice. Enroll now so you can start earning double Membership Rewards® points on virtually every dollar you spend on gas and groceries.
The only limitation is 1000/mo. Seemed like a no-brainer to me so I signed up.