I noticed a couple hot pixels with my D5000. It took a year before I noticed them right after my warrenty ran out. They were only visible with jpegs. I shoot strictly RAW and they are removed by lightroom so I decided not to worry about them because I could no longer see them.
"Cameras and lenses are simply tools to place our unique vision on film. Concentrate on equipment and you'll take technically good photographs. Concentrate on seeing the light's magic colors and your images will stir the soul." Jack Dykinga