There was an app for awhile.
Unfortunately, it was just too difficult to maintain. While NS is a relatively large site by number of users, it's still pretty small in terms of its backend team and funding available. And with the site's code constantly changing, it was a problem for the primary developer (@thegreyarea) to maintain.
Maybe someday the app will be reborn. But for now it's just too much.
Formerly known as "ski.the.selkirks," "selkirks" is proud to be a WDFY/IDFY member. For more information about WDFY/IDFY, and to find out how to sign up, visit this link: http://bit.ly/11Zhyx