Check out this interactive Flash app called “Dancing Typography” by Román Cortés – very well done. (The above photo is a static screengrab.) The creater describes it:

In this experiment/new visual effect, the letters from a lyric of a popular song – Never Gonna Give You Up — are repositioned to compose the images of its singer — Rick Astley — dancing in fluid motion. Take a look of it here.

Cortés had first experimented with using javascript code to accomplish effect: A Tribute to The Beatles But that rendered to slowly, so he used Flash instead.