I was looking for a quick resizing option for those times when I want to shrink a graphic but don't want to fire up Fireworks or Photoshop.

As somebody else noted, this uses an installer, which doesn't make sense. Small, single file applications are typically drag and drop. The only time you should need an actual installer is when it's installing multiple files in different locations.

More to the point, it lacks one important feature, namely the ability to set the quality of the output. I tried it on a 250kb 1024x768 JPEG file, reducing to 256x192. The output file, with 1/16th the area, turned out larger than the original by several kilobytes! That's ridiculous and unusable.

I tried ResizeIt as another review suggested. That does the job much better, but that's not perfect, either. It won't automatically constrain proportions, so you have to calculate the correct height yourself after you set the width. Still, that program at least works.