I started an interesting discussion over at the MPEG4IP list (well, interesting to me). The MPEG4IP project is a group that is working on end-to-end MPEG-4 interoperability, per the ISMA specification. I started by asking about widening the scope of their project to doing H.263/MP3/RTSP/RTP interop. Still early, but I think there's some definite possibilities there. While I don't agree with the tactic (promoting MPEG-4), the spirit of the project is a good one. They seem very interested in talking about interoperability using whatever means possible. The thread concerns asking them to widen the scope of things.