Just my two cents here...
I try and keep all pictures under 50K if possible. The problem I have with automatic resizing is it can really destroy circuit diagrams. For the most part GIF immages work great for diagrams and other low color resolution immages.
Automatic Jpeg compression of bitmap immages would be a good thing.
Maybe if you could trigger the software based on file size and resolution, rather than just on resolution alone.
Perhaps if you treated all pictures the same and made thumbnails out of them, then the reader could expand them if desired.
My machine is on a very small diameter hose here (26,400 if I'm lucky), and I can appreciate any effort to control the immage loading times.
-Bill-
P.S. My hat is off to you for having one of the best run and easiest to use forums around. Thanks again and keep up the good work!