Delta and American Express are offering a 45,000 mile bonus for the Delta SkyMiles Gold American Express card for a very limited time.

The email states:

For a limited time only, get the Card that makes travel on Delta more rewarding and earn 45,000 bonus miles toward Award Travel. This offer for the Gold Delta SkyMiles® Credit Card from American Express expires on December 23, 2012, so apply today.

Good luck!