Gabriel,
Great review of the WD TV Live remote app. I picked up the WD TV Live a few days ago and I'm using it in much the same way as you describe above. My LG BD670 BluRay player couldn't stream AVCHD video (got a new Canon HD camcorder for Christmas!) from a network share, so I picked up the WD TV Live, which streams AVCHD at full 1920x1080i resolution BEAUTIFULLY!
One question I hope you could answer regarding the remote app, which I am using on an iPad. If you tap the "speaker shaped" icon to the right of the power button (mute button?), the four color buttons at the bottom of the screen (A, B, C & D) go away and are replaced with what appears to be a volume slider which has a green check mark at the far right end of the slider. Can you advise what this is? It doesn't appear to affect the volume much at all and after I hit the green checkmark, it goes away and the A, B, ... buttons re-appear. All I got through my HT Receiver when I moved the volume slider was some "crackling" thru my speakers with almost no increase in volume.
Thanks in advance for your reply,
John