audio monitoring or network monitoring, or peep, or auralizer

"Sound is a good cue to problems. In one place I worked, we had a big board of dials showing what was happening to our web servers. The hands were moved by little servomotors that made a slight noise when they turned. I couldn't see the board from my desk, but I found that I could tell immediately, by the sound, when there was a problem with a server."
—Paul Graham

http://peep.sourceforge.net/intro.html
    auralizer
http://www.auralizer.com/
    dead on 2006-12
http://freshmeat.net/projects/netpeep/

http://itp.nyu.edu/~ap1607/nbo/
    networked byte organ
    http://myth.livejournal.com/359907.html
    http://itp.nyu.edu/~ap1607/
    http://itp.nyu.edu/~ja1276/blog/?p=26