The Millennium Dome (notably the Millennium Experience inside) was terrific. I don't know why nobody showed up, but it was really uncrowded and enjoyable to visit!

One futuristic thing that has stuck with me from the Millennium expo was a demonstration of structural/mechanical and electrochemical simulation of the human body with computers, for example the skeletal, muscular, and circulatory systems. Which of course can be augmented with models of various organs and micro-level models of cellular interaction and cell internals. The brilliant bit seemed to be the idea of using a finite element and/or modular decomposition, potentially at multiple levels of resolution and abstraction. It seemed like the sort of thing that could yield huge benefits in medicine, health/fitness, education, and video games/animation. ;-)

How so? There didn't seem to be much celebration of British achievements.