OK, it happened to me I have D7000 since about a month and a half (around 1200 photos) and already I see the spots at f22 or smaller. I was frustrated and filled the form on Customer's Service section of Nikon Canada. I sent them two photos with spots encircled and received the answer several hours later to bring my camera to my local Nikon Canada Service center after the Holidays Season (because I didn't want to stop shooting during Christmas and New Year). Great. I hope they'll fix it for good. Service Center is only a few miles from my office so it won't be difficult When I read on the internet about the nightmare some people had with Nikon Service who denied the spots were manufacturing failure, I can consider myself as lucky to have good service in Canada.