Been trying to figure out how Xserves work to see if a project I'm working on could use an Xserve cluster node as a stand-alone server with a 3-4 drive RAID. Here's today's surprising find...

(from here):
All access pass: The DB-9 serial port allows for system access through a serial console session, even when the network is down.

That's right folks, a DB-9 port! It would appear that, in case of emergency, you could hook an Atari 2600 paddle up to the Xserve -- even when the network is down!