good point about the Content-disposition: attachment. i have not got to that point yet as i have been involved with the streaming possibilities. i don't have any flash experience, so i am using the MP3/AV/WASP utilities that come with the flash-based Wimpy Player at
http://www.wimpyplayer.com/
Wimpy is fairly flexible, cheap, offers .flv and .swf video, in addition to .mp3 for the audio, and doesn't require me to learn any flash
