Twine

The makers of Twine are on the leading edge of the semantic web (what a majority of people say is “web 3.0″).

Its pretty brain racking, but the semantic web is basically a way of marking up content in a similar way we store information – subject, predicate, object. Connecting people and context to objects to add more meaning.

Here are some more details, the graph at the very bottom of the page is a nice quick visual of whats happening inside twine:
http://www.twine.com/tour/semantic