Lots o' people are talking about Gelernter's manifesto, and wondering why it isn't being made by anyone. It actually is being made, by Gelernter himself: take a look lifestreams, inc. and their products. Seems to me there is one big reason why more people aren't (and probably won't be) using this product: it's a completely old-style company: all the major tech behind it is patented, the product is closed source, etc. If Gelernter was more like Tim Berners-Lee, he might stand a chance of actually creating a revolution in computer interfaces, instead of just talking about one and releasing some interesting technology that nobody uses.