It works for me here, using Karmic Beta on both the library machine and the player machine. It isn't totally bug free, as occasionally the stream apparently breaks and Rhythmbox truncates the track and moves on to the next one in playing order. But I can add files of the type smb://thepathtomymusiconthelaptop to the Rhythmbox instance on my graphics workstation and it plays them fine apart from sometimes skipping out of a track before it should end.
It works for me here, using Karmic Beta on both the library machine and the player machine. It isn't totally bug free, as occasionally the stream apparently breaks and Rhythmbox truncates the track and moves on to the next one in playing order. But I can add files of the type smb://thepathto mymusiconthelap top to the Rhythmbox instance on my graphics workstation and it plays them fine apart from sometimes skipping out of a track before it should end.