Interactive video about authoring

I'd like to look at two things this month, not entirely unrelated. I wrote last time about compatibility and interfaces. Since then, a number of experts in the field, several of them American, met at a conference in London during October; I'd like to summarise for you some of what they said. At the same time, I'd like to consider the subject of ‘authoring’, the process which has put interactive design into the hands of users with real needs but no computer background.