I found I needed the neat image for my "old" A75. But now with the 20D and lack of noise except at ISO 3200, I didn't think it was worth while anymore.
I'm not sure what "neat" means.
Neat Image is a program to reduce the noise in an image (like Noise Ninja).
He was stating that the 20D has less noise so there was less reason to use a noise reducing program.