Hi I learned most of what I know about GIMP from just trying things and lots of online tutorials both written and videos on Youtube and I think a few at Vimeo. Some were more helpful than others but I think that is mostly because we learn in different ways. You have to find the ones that work for you.

I think I agree with you, it would be nice to have a GIMP forum here at Renderosity so we can all learn new things. I started with Photoshop and when I first picked up GIMP I had a hard time with the interface differences but eventually I overcame the differences as I learned more.