I love kinetic typography! This video by Nicholas Schrunk is not only a great example, but it takes it a step further by exploring human motion at the same time. Very well done, indeed.
"Kinetics" was an exploration into human movement and relating it to illustrative typographical elements. To achieve the footage to show human motion at the level needed we shot with a scientific high-speed camera at 500 frames per second in HD on a green screen for the performance. The subject of break-dancing was used because of its raw beauty of illustrating human motion. Typography is used as an illustrative element in this piece supporting the kinetics of the motion. The typeface Didot was chosen because it combined a modern feel with classic serifs.
A few more kinetic typography experiments worth checking out:
Social Life, With Friends
V for Vendetta
Fight Club - Chemical Burn
70 Years of Revolutionary Protest Music