would be possible to stream to my Soundbridge the music I play in spotify?
Something like Jamcast (http://www.sdstechnologies.com/) does. I’m using firefly from long time ago and I wouldn’t like to replace it from my computer but i really like that feature. I think spotify is very extended service and many people would like to stream their favourite music to any device. In my case, to my Soundbridge.
Try DSBridge http://code.google.com/p/dsbridge/. Drop dsound.dll along with listed dependencies in the Spotify app directory, start Spotify and play some music. Point your Soundbridge at “http://localhost:8124/” and hopefully you should hear music playing.