I imagine that the OGG container has a way of storing some file data as a header or something... right? In OggMux, you can set a title at least. Anyway, just thinking about some useful info we can store in our OGMs, such as: Title Year Studio Producer Director Source - DVD, VHS, TV-NTSC, TV-PAL, HDTV Aspect Ratio (at which it should be played back) List of cast and crew, variable The cast will of course have the name of the actor and the name of the character he/she played/voiced. The aspect ratio is for maybe anamorphic movies, etc. Anyway, just a thought. Of course, the next step would be for all the players to read and display the info. This would be very nice when we all have terabyte drive space and we store all our movies online. Easy indexing :)