In addition to the Apple brochures that Matt "Simpsons Creator" Groening drew in the early Apple days, he did this great poster for Akbar n' Jeff's Communciations Hut.
Update: Jeff Miller sez, "Matt Groening
did this poster in 1988 for the the networking and communications
group at Apple in exchange for a LaserWriter, if you can believe it.
David Multer (Akbar) and I were the engineers on MacAPPC, which was a
mainframe networking standard championed by IBM. We couldn't convince
David to change his name to Akbar, though."