I don't experience this clicking noise on my 18-105 kit lens even with VR turned on.
However, with this 18-200mm, the VR clicking noise is too noticeable. Nonetheless, after I switch off VR, no such clicking noise is encountered. It's totally silent except for a very minute noise from the SWM auto-focusing.
I don't believe in paying so much more for an 18-200mm but getting such a noise. So definitely sending mine to NSC.
Do look at the thread below from flickr. The thread starter sent in his lens for repair and this is what he had to say after they fixed it:
"Sorry but it was not "perfectly normal". Having exchanged the lens the difference is massive. Much much quieter and no creep. As i said before make sure you get a good one."
http://www.flickr.com/groups/nikon_18-200_vr/discuss/72157610395284986/
Blade, do update when you get yr lens back! Looking forward to hearing your reply!
no prob man but its been more than a week alr still no call from them :x