A whole collection of "facade projection" videos here.
"Urban Projection Mapping, as it is loosely known, is the art of creating video displays that make buildings come alive in light, color and motion. Armed with powerful technology, a handful of enterprising video artists create vivid, visually arresting video displays that are projected on urban architecture."
These things are teh awesome! My favorite is the one that the Agitator featured.
(Hat tip to The Agitator)