It would be nice if some one could create a video tutorial of them painting. This would be nice to see how other people paint just to get some tips from. As I know my way around ArtRage it's just sometimes you wonder, how did they do that?
Thats not a bad idea, I know you can get software that will take screen shots every few seconds or on command. You could then string these frames together to make an animation, then do a voice over.
I have made animations as part of my day job this way... Another option would be for people to start describing how they did a picture, or what alterations they do and why. I can be quite absent minded so even my own notes next to pictures I display are useful later on.
Wink is a good candidate for tutorial making, and it's free...