Desktop: Zeus (My main computer)
Laptop: Apollo (DJ Laptop)
Netbook: Hermes
Router: Hestia
Workgroup: Olympus
Personal server at work: Hades
Went with kind of a Greek mythology theme... Each machine has a name of a god which kind of represents what it does.
My desktop is my main, so it gets "Zeus" being the master of all Greek gods. My DJ laptop gets "Apollo" as Apollo is the Greek god of music. My netbook is portable so it's named "Hermes" as Hermes is the Greek God of flight, thieves, commerce, and travelers. The router is called "Hestia" as she is the Greek goddess of Hearth and Home. All these machines are on the workgroup Olympus as this is where all the gods lived.
The server is called "Hades" because its the Greek god of the Underworld. It's stored at work... 'nuff said. =P