I'm sure I'm not the first to think that especially Nebula is something that would really benefit by offering some quick tutorials. Nothing long or with too much effort. I mean quick and easy video tutorials even without speaking, only with some subtitles to let the viewer know what happenes.
Besides that: having stuff like this online is extremely great promotion and could catch alot attention (esp. on youtube etc.) with the right tag-words...
Basics such as changing the skin, saving an own preset, how to use the renderer or place programs/vectors in the correct folders are things people LOVE to watch to make it more accesable to them.
These vid's wouldn't have to be any longer than 10-20 seconds.
I'm using nebula since more than 1 year but I basically use it very simple and had major problems before, saving one preset as a new adjusted one.