The folks in charge of marketing the SkyMiles cards have sure been busy lately. Other recent offers include a 5,000 mile rewenal bonus and a 25,000 bonus miles signup promotion. The latest offer, as spotted by FW, is double miles on all eligible purchases between June and August for Delta Business SkyMiles cardmembers:

Visit http://americanexpress.com/deltabonus or call 1-800-653-6051

Note that the link somehow is connected to the old 20% bonus offer, either you could wait until they update the link or you could call them to enroll.

TERMS AND CONDITIONS:
Enrollment required by 08/31/06. If you prefer to enroll by phone, please call 1-800-653-6051. The double miles will be applied to the total dollars of spend posted to your account from 06/01/06 to 08/31/06. Please allow 6-8 weeks after the promotion for the bonus miles to be posted to your Delta SkyMiles account. This offer is available to Delta SkyMiles Business Credit Cardmembers only. Cardmembers who earn Always Double Miles?will continue to earn Double Miles for eligible purchases. To be eligible to receive bonus miles, Cardmember’s account must be active and not in default at time of bonus fulfillment. Balance transfers, Express Cash, and U.S. Savings Bonds transactions do not apply. Bonus miles for this offer are limited to 20,000 miles. Promo Code H250:0001. All SkyMiles program rules apply. To review the rules, visit http://www.delta.com/skymiles.

The URL for this promotion is not active yet, as enrollment begins June 1, 2006.