jpgs are in their nature, a compressed and lossy filetype. Thing is that for most purposes, they are fairly ok for pictures and in many programs, you can alter the amount of compression, (read quality) to suit.
Changing the size of the pic will also reduce filesize, but to give a comparison, I have jpogs of up to 7 MB from my trusty Nikon, but with a bit of fiddling can have something that will suit most people weighing in at around 150KB
I suppose what would be really useful now, is some clue as to a wonderful, full featured and intuitive package that costs bugga all.
IRFANVIEW!
Conan