When I've uploaded some new images and they need keywording, in 'Manage Images' I like to have 'all images' open so that I can copy keywords from any similar images to the new images.
I know you can just see any un-keyworded images as that comes up by default but then you can't see your existing pictures.
It would be a good idea when looking at 'all images' if any un-keyworded images had a red box around them to make them stand out from the others and to let you know they aren't yet keyworded.
John.