Projecting onto buildings has become a somehow common thing. I have never seen it combined with interactivity and data visualization though.
Come to your Census[spinifexgroup.com] was developed by Spinifex for the occasion of Vivid Sydney, a spectacular festival around the theme of light which happened about one month ago.
The installation consisted of 3 different parts that visualized several datasets from the Australian Bureau of Statistics. The main interactive projection mapping showed data like Age & Gender, Country of Birth, Mode of Transport and Occupation of every postcode in Australia, which then could be interactively steered from a multitouch table in front of it. Another projection mapping displayed a normal infographics-based animation, while several interactive kiosks offered access to the ABS Spotlight website, an infographic story-tellingw website that describes several census statistics from a personal perspective.