Wow - I feel so out of it. I had no clue what you were talking about and had to google around a bit. ('Kinetic typography' turns out to be a better phrase to google).
No clue how to do it efficiently, sorry, but thanks for the heads-up on the concept!
P.S. The second one here (Intonation) was fun:
http://devsushi.com/2007/02/26/kinet...-audio-sample/