I just received in the mail the $15 gas card after buying 3 American Express gift cards and getting $10 ECBs at CVS. It was a money maker.
In the envelope is an offer for a Card Fee Waiverd on Your next Online Purchase. Not sure if anyone else can use this or not.
Shipping and Handing charges will apply. Offer valid through April 30, 2009 and only on web orders. See additional terms and conditions at americanexpress.com/gift