If you like this, you might like http://quickfuseapps.com , which is basically logic circuits for voice apps. Demo calls are free.

Also, QuickFuse doesn't use Flash, it's pure JavaScript and canvas, so in my experience it's a bit more performant. (Full disclosure: I wrote code for QuickFuse.)

Incidentally, is it just me or are circuit-based apps becoming more popular? It seems like it is becoming a more accessible paradigm to more people, and the web (well, ignoring Flash) is now able to robustly provide such UI's.