maybe you can tune into a slim stream as if it were a shoutcast stream. i haven't tried it, but i know you can point winamp at it & it will pick up the stream (ie open 127.0.0.1:9000/stream.mp3 in winamp )

an easy way to do test this out is using a third party client w/ shoutcast support.

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I have been looking at buying a slim devices squeezebox, and noticed that the slimserver software it uses is open source. Has anyone tried to get it to work with the Rio? I don't know how possible it is, but if possible it would be worth it. It supports ogg, flac, itunes, mp3, wav, etc and is not nearly as complex as the jreceiver.