I just want to say that I'm loving the interactivity of this prototype, e.g. the ability to load and edit real articles, use search, etc. It gives a much more realistic feel of the underlying ideas. I hope we can use this as the new gold standard for prototypes and indeed re-use the underlying code as much as possible. :) We don't need to build such prototypes for everything, but for comprehensive explorations like this it's really the best approach I know.
Thanks for all the attention to detail on this, which is really starting to show. :)
Erik