It seems a really interesting place, nice tutorials…

Michael, try this: http://www.gimpusers.com/tutorials.php

A resource I’ve found quite useful is the gimpbook (http://gimpbook.com/index.html)

I find it easier to pick up concepts by watching your videos, Rolf. The pace and your narrative style fit the level of detail just perfect — for my tastes. I hope you never run out of enthusiasm for producing these episodes.

If you are looking for more topic suggestions, I think the layer blend modes (and paint modes) would surely be a rich source of subject matter. You have already given more insight than I have found elsewhere with your incidental mention of multiply, overlay and screen. I’d like to see more of the same approach — examples of use to achieve specific effects.

If that gets boring, the filters are probably an endless source of confusion for many; perhaps you could continue on that subject. I liked the way you did the unsharp mask, for example.

Regards,
..jim