Northwest has unveiled its new mileage promotion, Mountains of Miles. Not as great as the last one, not every activity under the sun earns credits towards miles (without any meaningful activitiy with Northwest — I’m not particularly involved with their program — I still managed to bank 10,000 miles last time).

Still, as always it’s worth registering for the promotion no matter what because any sort of activity at all will earn some bonus and you never know when that activity might just turn up, such as by getting re-routed from your planned carrier onto Northwest during irregular operations.

Register for the promo by December 31, 2008. But, really, register right away — because only activities from the time you register count. Activities completed by January 31, 2009 count towards the promo. And sadly, Northwest Worldperks members outside of the U.S. and Canada are not eligible to participate.