I've been wondering about various noise reduction software including NeatImage, Noiseware, Noise Ninja, etc.--specifically, which one would best complement or work with CS2 on .jpg and .tif files. I know that at least NeatImage has a freeware version, I could try, and that CS2 also has a noise reduction filter (which seems rather perplexing to me).
Also, where in workflow should one apply such a filter? (I always work on a copy never the original). Should it be applied before or after resampling / resizing? before sharpening, levels, etc.?