Javascript Audio Generation

I haven't looked into the actual source code of this ... But javascript just joined the audio-generation racket, check this out:
http://ajaxian.com/archives/generating-and-playing-sound-in-javascript

And a couple of days ago somebody made a drum machine with (only) javascript:

http://www.themaninblue.com/experiment/JS-909/

That comes complete with an audio visualizer built in JS, but I suspect it gets the hits etc. from the switches themselves instead of the audio generated.

I love this renesaince of coding that's making music production much more easy to experiment with...