Jpegs can still be optimised further, it all depends on how sharp you need the images to be. If they are to be printed off then maybe they are best left as they are, butif they are intended to remain on screen, you may well be able to compress the files further.
Irfanview has a batch conversion ability that would allow you to reduce the file sizes if printing of the image is not the intention
-------------------- "Only the stupid don't ask questions." My piccies