Probably one of the coolest ads I’ve ever seen, mostly because of the music:

This was at the end of a video of Amy Tan’s TED2008 talk on creativity (mp4 of the talk).

This video is what would happen if advertising firms were run by Kronos Quartet and Philip Glass. There is also a longer version of this spot with different music, and therefore not nearly as cool because of it.

More impressive is this video, also by Autodesk, also about the TED conference. This one has some really nice animation and a sort of Nathan-Fake-inspired soundtrack.

Hi-res versions of the 2nd and 3rd videos can be found at Autodesk’s TED2008 site. I don’t know why they wouldn’t post the 1st one too, especially since it’s the best one by far.