This allows you to run application on one computer, and hear the sound on other computer, via network.
Server (where you want to listen):
esd -promiscuous -tcp -public -port 150 &
Client (where sound application runs):
esddsp -v --server=server.ip.number:150 -m name_of_the_program
I don't like esd too much, but this once was a very convenient thing.