I really miss my DN3500 (68030 box with EISA bus and ESDI disks, from memory) - Domain/OS (and Aegis before it) was a surprisingly fun OS, switching between Aegis, BSD & SysV userlands, and it came with enough compiler tools for me to write an AutoCAD driver for a Summagraphics tablet I picked up around the same time. The windowing UI was surprisingly pretty too, and Apollo Token Ring with its whacko RAM-over-Network architecture worked surprisingly well. It's a real shame HP swallowed them, but perhaps the moral of the story is not to try to ship 3 different OSes at the same time on the same hardware (and not to write a huge evolutionary fork like Aegis was).
Edit 1: The DN3500 also came with a hardcopy of this PDF :)
Edit 2: From memory, it also came with a surprisingly good super-early guide to TCP/IP and the Internet, complete with a hardcopy of the HOSTS file in case you couldn't get it via FTP from Internic ;)