It's been just a week with the D70 18-70, and now I exclusively use NEF format. The photos are imported in photoshop elements, requiring just an extra step (and <10s) to edit (but they can visualised as .nef). When I see what the camera would have produced as a JPEG for many of these shots (mostly family shots under difficult lighting conditions), I am happy to be able to tweak the good images (mostly temperature, overall exposure, luminosity, contrast, but other settings are also changeable). I am sure if I bothered to balance white correctly, or concentrate on getting the right exposure, I could get decent JPEG directly, but now I can concentrate on shooting and not the technique. Given the ease of use of NEF now, why would you choose JPEG? For a factor 2 storage space? A bigger card would be better... For fewer steps in post-processing? converting to JPEG takes <10s... Other? I used to shoot Canon RAW, and convert, and it was slow and painful, so I used JPEG and just adjusted the images... now I adjust during conversion from NEF to JPEG, the results are much better.