No, we're not talking about "the cloud" where data goes to disappear and (hopefully) be retrieved again. We're talking about an actual (well, artificial) cloud that promises to be both a real structure and a massive digital display. That's the bright idea of a team of researchers from MIT, anyway, and it's now been shortlisted in a competition designed to find a new tourist attraction to be built in London for the 2012 Olympics. Dubbed simply "The Cloud," the structure would consist of two 400-foot tall mesh towers that are linked by a series of interconnected plastic bubbles, which would themselves house an observation deck inside and be used to d