As there was genuine, repeated interest in NSK's user identity and NSK has AFAIK still not clarified his identity himself, I will "blow the whistle", that is, I will relay the relevant info (which is, after all, freely and openly available):
NSK appears to be [[en:User:Npc]]. He has been active since October 23 and as of this writing has made 96 edits. A certain share of his contributions are insertions of links to his own wiki projects. These link insertions may be (or may not be) perceived as inappropriate, but others be the judge of that. Not all of NSK's contributions are such link insertions and IMHO some of his contributions are quite ok.
Sorry to be the one to "blow the whistle" but I feel there's a public interest; no offense to NSK.
-- ropers [[en:User:Ropers]] www.ropersonline.com
http://www.archive.org/movies/details-db.php? collection=independent_news&collectionid=Mosh