The combination of HTML5, JavaScript and the evolution of browsers will allow for audio manipulation and visualization similar to what can today be achieved with Flash.
David Humphrey has been experimenting on top of Mozilla’s extensible platform. His explorations can be found at the Mozilla Hacks Blog:
http://hacks.mozilla.org/2010/04/beyond-html5-experiments-with-interactive-audio/
More on David’s experiments with audio:
http://vocamus.net/dave/?cat=25
Other articles mentioning this:
http://www.webmonkey.com/2010/05/new-html5-tools-make-your-browser-sing-and-dance/
http://createdigitalmusic.com/2010/05/03/real-sound-synthesis-now-an-open-standard-in-the-browser/
http://createdigitalmotion.com/2010/05/3d-sound-now-in-the-browser-and-processing-js/
One example, quoted from Mozilla Hacks: “(…) done by Jacob Seidelin, and shows many cool 2D visualizations of audio using our API. You can see the live version on his site, or check out the video above.”