There have been a few thoughts about something like this here.
See: http://forums.fireflymediaserver.org/viewtopic.php?p=15468
I still think its doable, but the question would be how to “trick” the Soundbridge into browsing it like an artist, or album.
I could see how one would have to swap artists and albums, which is ok I think, and create one, or two “special” artists so when you browse by them you really get the view that you created in Winamp.
Still, thats a long shot.