Great, Short Art Tutorial

Last night I came across one really good and still not too long general art tutorial. It can be found at:

http://itchstudios.com/psg/art_tut.htm

And is recommended for general reference conerning various issues (shading, coloring etc) or as a "mini course" in itself. As the author advices though, it's a lot to digest so take a little piece at the time and give it a few months between the visits. Hope you'll find it useful.