Thanks, but I’m actually making a mod, not a plugin. I’m adding a sort value to the “Manage, Categories” admin panel. Thus, I need to list the code I’ve changed in the standard WP distribution. I’ll just use some kind of diff format.
A unified diff would be fine for those who know how to use them. Otherwise, you could distribute a fully modified edit.php (or whatever file it is that you modify).
Mods of this sort are generally discouraged, though, as they complicate upgrades. If at all possible, try to make this a plugin. If a plugin is simply out of the question, try to figure out why and suggest a way to make WordPress support plugins of this sort. =)