As a side note, I said something earlier in this thread about the 21" CRT being the heaviest Apple product ever produced.
I've since learned that I was actually incorrect. There are two products that are heavier, and I own a couple of examples of one of them.
The Apple Network Server tips the scale at somewhere in the neighborhood of 90lbs.
Even more staggering, though, is the XServe RAID, of which I have 3. Fully dressed with 14 drives, these tip the scale at well north of 100lbs.
Apple actually cautions not to put one in a two post rack...since I don't have any "small" four post racks, I'm pushing my luck and actually have two of mine at the bottom of separate two post racks(one of mine doesn't have drives in it, so it sits idle).