Which parts do not have the LEGO logo stamped on them?
I certainly don't have a list, but I came across Technic, Steering Arm with 4 Ball Joints with Black Wheel Hub (x872 / x873) part several times. I heard stories of Bricklink sellers being accused of shipping knock-off copy of this part (since it is a little pricey) due to absence of LEGO logo, despite them being legit items.