Homebrew Development: Cel-Shading Tutorial & Source Code

Do you still remember the Cel-Shading Demo by McZonk from Team Emergency Exit, which
PSPUpdates reported back in August? Now, McZonk has finally got some time
to write a great tutorial. He also enclosed a sample source code in the
archive.
You can download the tutorial and the source code from PSPUpdates QuickJump download site [here].
Cel-shading is like 2d that looks like 3d... if you've ever played the XBox game Cel Damage, you'll know what I mean :)