Following the iTunes9 announcement, someone who wants to stay anonymous pointed out to me that Banshee has had a solution for the home syncing for months now. If you click on the shared music sources, you get what you expect streaming access to all the music and video on that system. But if you right click you can import everything or subsets of the remote music source. You can then setup a rule to automatically do this with mobile devices like the Gphones, ipod, windows mobile, MPD or any mass storage device. Its not quite syncing but its not far off
