Replying to say that while the N900 definitely can stream via CIFS, the speed is too slow to allow for higher-quality music like FLAC (even tried running the command through Terminal with -direct, no dice). Lower-bitrate music (think MP3 v2) would probably be fine, but I haven't tested so no promises.

Shame; with Rockbox it would have made the N900 a great little DAP. As it stands I'm using CM9 on my HP Touchpad to run Rockbox and it has no issue streaming from the Node.

http://i.imgur.com/QpDe3.jpg

I would try the N9 out but lack of gapless playback makes the exercise seem pretty pointless. Unless a new app's launched and I missed it?