Rolf,
I am looking into recording a demo of how I use GIMP to create a rotating
ambigram image for use as a forum signature. My only worry is recording audio - I rarely have time or privacy to record audio. I might have to use overlay text and let you pick some music to play in the background...
In any case, do you think this would be an interesting topic? Is there any information i need to know about submitting video to you (format, resolution, etc.)?