A while ago I read an excellent treatise on resizing images without visible aspect distortion, using an intelligent slicing algorithm. I even found a Gimp plugin to do this, but I have completely forgotten what the tech or the plugin is called.
I now use Paint.NET for editing, not Gimp, but will reinstall Gimp if I really have to. I would prefer a small stand-alone util to help with this. Can anyone suggest something?
IN CLOSING: Thanks to krhainos's answer, I found Liquid Resize Retarget for Windows, which is perfect for what I wanted.
This tech is called seam carving.