A good friend of mine and a good photographer, too. He is blogging about Sony Alpha cameras, (native and adapted) lenses and other general photography issues.
Eric Tastad (English)
His blog offers many good reviews/tests of camera lenses, including Samsung NX.
Discussion Boards about Samsung NX
Digital Photograpy Review (DPReview) Forums (English)
An active forum about all Samsung cameras, not only NX.
Biggest german photography forum with an active Samsung NX area.
Systemkamera Forum (German)
German forum about mirrorless interchangeable lens cameras with a calm area about Samsung NX.
Blogs about Samsung NX
All about Samsung (German)
German blog about all Samsung products, with up-to-date articles about the current development of new products.
NX CSC (English)
Discontinued blog about Samsung NX, but has some good in-depth articles and reviews.