The sysadmin approach to information is "log everything". If you don't know whether something will be useful, log it. You can always throw it away later if you don't need it but do need the disk space. I often wish I had instant full text search of everything I heard -- what did they ask me to get at the store, again? It's like gmail: once you can keep and search all your mail, you don't have to extract all you need from each message as you get it. With gmail people could know that they would always be able to refer back to an email, and so could safely skim messages with picky details they might need later. Some people (me) are already applying "log everything" to their location, and as soon as it is cheap and easy to do so I think this will extend to audio and video as well.