Noah , Apr 05, 2009; 07:03 a.m.
I use Photomechanic for all of my captioning, editing and keywording. It also can batch rename files, and it does so for all the formats I've tried (tiff, jpg, nef, dng, etc.) It will also batch rename your camera jpg files at the same time as your nef files and will keep the two with the same filename but different extension just as it should be.
Photomechanic is pretty much the standard editing software among the photojournalists I know. By editing in this case I mean sorting and choosing photos, it doesn't replace the role of Photoshop.