There is in Maya 7, but I made this in Maya 6 (actually, back then might've even been 5). I just contstructed it myself. It's really not that hard with a little knowledge of shading networks. Make a ramp shader, and under color, set the input value to brightness. Set the Interpolation from linear to none, and put about 4 colors in, from black at the very left end, to a few shades of the color, to white or a bright color at the right end. optionally omit the whole white and black parts. Adding an edge is a little more complex, but not that hard if you know what you're doing. Make another ramp shader, change the color's input value to facing angle, and make the color all black. Just one black. Then go down to transparency and make it so that the transparency is all the way at white when you're facing it, and black when it's facing almost 90 degrees from the camera, this will create the black edge only at edges from a certain angle, like a drawn edge (although I didn't use that in this particular movie, it works well). Then, use a layered shader to put the outline on top of the cel shader.

Thanks a lot. Yeah, a lot of people didn't appreciate it, but that's what I was going for.