Delta is currently offering a promotion for new card holders to by referred by current card holders. I can get 10,000 miles for referring you and you will get 20,000 miles (5,000 are medallion qualifying miles). You get an additional 5,000 miles if you add someone to your account.
Email me if you are interested: firstname.lastname@example.org. I'm always looking for a few more miles so I can head South to the family!