The Swedish Oracle User Gruop, SweOUG, recorded a full day of training on Edition-based Redefinition. Here are links to the sections:
HERE are the slides used during the seminar.
And HERE is a zip of the code for the "green screen", "red screen", "blue screen" demo used. Notice the file READ_ME_FIRST.rtf. After you've watched the video of the demo, it should be clear to you how to use the code.