Music video for Daft Punk's Around the World: as RealVideo; Flash on YouTube [via robotwisdom]. Brilliant. Now, how can do me a machanima version, hook the dancer groups into different frequency ranges, and make the entire thing into an iTunes/WinAMP visualiser that I can use for any mp3? Come on! Visualisers should be way better than they are now.
See also, Michel Gondry's video for Star Guitar by the Chemical Brothers. Architecture dancing to rhythms as seen from a train window, what could be simpler to generalise? I bet you could write the entire thing in Lisp and run it right in AutoCAD if you wanted, but a music visualiser would be cool too.