Some Important Render Passes

These some passes that will help to easy manipulate CG when comping it.  One may need all of these or more or just few of them, it depant on the final output.
Beauty
Diffuse
Color
Ambient Occlusion
Indirect
Shadow
Reflection
Refraction
Specular

Some other helper passes to add effects and other things:
Z Depth
2D Motion Vector
Normals
World Space (point world)
Id\ Mask
UV