If file size is the issue, then you could try lowering the quality of the JPGs. I've lowered them to 50% and haven't noticed a big visual difference, but get 60% smaller files.
QUOTE (LyricsLover @ Jul 19 2009, 07:24)
I use the free commandline collection imagemagick
and the tool 'mogrify
' to resize all my covers (from different sources) to exactly the same size.
XnView might be slightly easier to use for beginners than ImageMagick.