While this isn't really a TenFourFox related topic, but sort of anyway since VLC can be an alternative or workaround to plugins, I have to say that the PPC version of VLC 2.x is pretty much unusable. Slow and buggy. Also, personally, I don't like the new user interface at all, so I'm still on 1.1.11. That said, VLC 2.0.10 plays an audio stream like http://wmlive.bbc.co.uk/wms/england/lrlondon?MSWMExt=.asf just fine. I didn't test video, though.