Well, I tried using Image Magick to resize thumbnails, but it doesn't respect aspect ratios (or at least I couldn't figure out how to make it retain the aspect ratio using the perl interface - or I should say I didn't want to put any effort into this). A week or more ago, I found a simple JPEG thumbnail library called Epeg - it also has a corresponding perl module. Yesterday evening, I worked through getting it compiled and installed, tonight I took it for a test spin. It works easy enough to call good. It does a basic thumbnail reasonably well. I wouldn't call the output great, but it is good enough to get about 80% of my thumbnails done in one quick shot, which is a big help. I can hit the rest with Gimp. Of course, the major drawback is you can only use JPEGs ;(
