Lately I have had to repetitively refine graphics in The Gimp, scale, set up guides, save final image to the project folder, and the comes the labourious part: using Gimp to measure each sprite and copy the details to the config files.
So I got out a rock and smashed another rock over and over (standard Script-Fu development process) and made a script to get rid of this slow process. Hopefully it'll be handy for some of you guys.
Head over to the wiki for the details and the download: Addin for The Gimp to Extract Guides for Configuration
In effect this: