YAYMan (Yet Another Yamj Manager) is a GUI which allows you to edit the information for individual videos without having to delve into the XML manually.
YAYMan requires YAMJ r3597 or newer.
See the included readme for running YAYMan on Ubuntu.
You can find additional downloads, including native application launchers for Windows and Mac, here.
February 26, 2013: v0.99.99.25 released. Fixed compatibility with latest YAMJ.
Please post all questions to the support thread below: