Found on mileageworkshop.com that there are two NWA/Sprint promotions:

Earn 10,000 Northwest WorldPerks miles for signing up for Sprint Nickel Nights. 5,000 Bonus Miles will post in 6-8 weeks after your first and sixth Sprint invoice for a total of 10,000 miles. Earn an additional 500 miles for signing up online.

Earn DOUBLE Northwest WorldPerks miles for every dollar (10 miles per dollar spent instead of the usual 5 miles) with Sprint Nickel Nights. Plus earn 7,500 Bonus Miles just for signing up. This promotion offers an additional 2,000 points per additional line registered.

I'm currently a very long-term AT&T customer and will anxiously wait to see if Sprint lives up to their "promise" of the points. If not I'll switch back to AT&T and CO points.

Anybody know if the 25,000 point offer is still available?