Through April 20, Northwest Worldperks is offering discounted international redemption for travel through June 15. The offer applies to Delta, Northwest, and KLM-operated flights only. If you don’t have Worldperks miles, but have a balance with Delta Skymiles, you can of course transfer your Skymiles over to Northwest instantly to take advantage of the offer (it wouldn’t surprise me if Delta is offering the same or similar deal but I haven’t yet checked).
The offer provides for a 10-20% discount on coach awards and a 25% discount on business class awards. Fourteen day advance booking and a Saturday night stay are required.
Update: As expected, Delta is indeed making the same offer.