I wanted to demo an ad rotator the other day at work and I wanted to load up a bunch of images of various sizes to make it look legit. It would have taken forever to do it ad by ad, so I wrote a little ruby script to automatically resize all the images in a directory. Then I used my directory listing utility to copy the files into my clipboard. Pasted into the database from there!
(Requires GD2)
Usage:
r = Resizer.new input_path, output_path, width, height
r.crop_files