“Daudio” is a program I wrote to solve one problem: how can I have any arbitrary number of computers in close proximity play the same thing? Conventional remote audio solutions (shoutcast, icecast...) are inadequate because they were never designed to have enough synchronicity for two computers to seamlessly play the same thing in the same room at the same time (too many buffering issues). Daudio solves these problems to provide you with a fully distributed audio network.
Daudio is in beta stages now, but there is a fully working, relatively stable version available for download now: download daudio.