The Apple III held up as an example of spectacular failure, unexpectedly spotted in an audio production magazine.
If, like me, you don't know much about the III, check out the Drop III Inches podcast: http://drop-iii-inches.com/ (Thanks for the recommendation, John!)
Of particular note are the interviews with:
Colette Askeland (PCB layout technician who also worked on the Macintosh)
Wendell Sanders (designer)
Dave Ottalini (III advocate formerly with the Washington Apple Pi user group)