A project to turn Doom into a sysadmin / data visualization tool back from 1999: "I am proposing a new mapping for managing system loads. As mentioned above, people frequently talk about "blowing processes away", and the Unix command to destroy a process is "kill". This suggests a metaphor for process management. Each process can be a monster, and the machines can be represented by a series of rooms."
From a related search: VisitorVille is a real-time visualization of site traffic as a 3D crowd.
Do you know of any interesting attempts to visualize web traffic and server events in real time apart from VisitorVille and Digg Labs? Something like Fudgie, maybe? Comments open.