You want to spot the real pro in the machine room he (or she) has a vacuum cleaner in one hand and a Brother p-touch in the other. I honestly beleive there is a direct linear relationship between the efficiency and uptime of a shop and how anal they are about labelling stuff. I want to open a front door of a rack and see every server's hostname and every removable media device clearly labelled. I know YOU know that that CD-ROM drive is drive D: on the frodo server but I ain't got time to try to figure that out. Even more importantly I similarly want EVERY cable in the back of the rack to have some kind of useful label on both ends (unless it is less than a foot long then just one end is OK).