Demaestro - 4:44 pm on Oct 8, 2010 (gmt 0)
I don't know of any good GIMP ones but there are 2 sites I learned Photoshop on.
#1 was [Lynda.com,...] although most of their tutorials need a paid membership they are amazing and they are designed like classes. For example there is a class on creating a certain effect, within that class there will be 10-20 5 minute videos walking you through steps, concepts and pitfalls... as well as shortcuts, which you learn to love.
I think Lynda have some free tuts and my copy of CS3 came with a disk of lessons and a free trial from them. I have no idea if the student copy is slimmed down or not. I would assume that it is. Also it seems that Lynda is some sort of 'official' tutor of the all the Adobe Creative Suite programs.
The second site which is 100% free is [psd.tutsplus.com...]
They are user submitted tuts and they get voted up.. there are some really good ones and going through them you learn little tricks and gather cool brushes along the way.... the down side is there is very little help along the way except in the comment section which can be flooded with stuff that doesn't help... often the steps assume you know something, like they will sometimes just say "add noise to the background" and if you don't know what that is you can be stuck searching elsewhere to figure it out.... not that it is bad but it isn't as formal as lesson as you would get on Lynda.com
Lots of Youtube videos to follow too.