Eric Drexler‘s vision of nanotechnology was once the main such vision, before nanotech became a popular buzzword, debased to mean anything with nanometer scale structures (enabling a huge national research initiative on the topic to be funded by just relabeling existing research).
Drexler has continued to elaborate his vision, and he now has a (86MB) movie to help you visualize it, available free to download. Beats the summer SF flicks as a thought-provoking vision of the future.
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