Here's a short demonstration video of indirect lighting in Blender 2.5 Alpha 1. There are no lights in these scenes - all light is emitted by the geometry.
I wanted to test the new indirect lighting feature in alpha 1 so i create some
scenes and combined them in this video.
No lights were used in any scene. All light comes from geometry and having indirect lighting turned on. Renders took an average of 10sec per frame at 720p.
There is this related thread where I share settings and captures.