Nice review, it's called Cel Shading though, not Cell Shading. Cel is short for Celluloid Sheet, which is a traditional animation term, as they used celluloid sheets for drawing on, which they just called cels. Why they didn't write it cells, I don't know, but possibly because they wanted to distinguish it from the other meanings of cell. Although you could call the post render filter cel shading, cel shading is actually when you use a 1-dimensional light map like the toon pro shader system.