I found out that .nsv is composed of MP3 for audio and VP3 for video, both of which are open source codecs. The shoutcast player in xbmp can already handle encoded MP3 so I figure we're already halfway there

. Anyway, VP3 source code and info can be found at VP3.com, for any of you budding developers. I think this could be great for xbmp as there are more and more quality winamp tv channels around.