I have been trying to make uPNP A/V and DLNA work for years without success. From an early Philips Streamium, to an XBox 360, and now a Sony NS400--none have had acceptable results for me. Right now my biggest annoyance is that none of the iOS DLNA controller apps I can find will play music continuously without being constantly on and in the foreground. I think this traces back to the fact that DLNA renderers are stateless and have no concept of a playlist, so as soon as a song stops the controller must be waiting for the event and ready to send the command to play the next song (this also explains why I've never heard gapless playback with DLNA either). If the controller is powered off, asleep, etc. then the music stops.
Nice! I was hoping somebody would make a remotely controlled DLNA controller to fix these issues. Just setup BubbleUPnP and it seems to work with PlugPlayer on my ipad--most importantly music actually continues even when the ipad is asleep. For some reason I don't have volume control or the ability to pause (but can stop), but at least I can listen to an album and browse the web. It's pretty sad that DLNA alone completely fails at this task.
This OpenHome is interesting, there's a lot of stuff going on here! An OS to host Web UI's for controlling a network stack... whoa, there's a lot here.
There are a lot of AV components, listed at http://openhome.org/wiki/OhMedia . Multiroom and party-mode synchronized audio are there too.
