You’ll have to move fast on this one. Through May 31, 2007, earn up to 25,000 bonus miles when you apply, are approved, and use or pay the annual fee for a new WorldPerks Visa Signature or Business card (earn 20,000 miles for the WorldPerks Visa Platinum card). Also, earn up to 25,000 bonus miles in addition to the miles you earn for enrollment in the card by completing qualifying mileage partner activities such as using mortgage and real estate partners, wireless service, staying in partner hotels, renting a car, purchasing a cruise, buying miles or shopping through WorldPerks’ online mall and many other partner transactions (see Northwest’s Web site for complete details). If you already have a WorldPerks card, you can earn up to 25,000 bonus miles when using partners, or if you sign up for a different WorldPerks card than the one you currently own, you can earn up to the full 50,000 miles. You must register for the promotion to earn the miles at http://www.nwa.com/offers/perkology/