Repair Disk Utility's Permissions solves an unusual problem: One of the more ironic permissions issues in OS X Jaguar is when the permissions of the Disk Utility application itself become corrupted. This can prevent you from being able to use Disk Utility's "Repair Permissions" tab to repair the permissions on your disk, including those of the Disk Utility application itself.
What's new in Repair Disk Utility's Permissions
Rewritten as a Cocoa (AppleScript Studio) application with a cleaner interface.
Added a workaround for an AppleScript bug that could prevent a user whose password is blank from successfully executing the "do shell script" repair procedure.