Ryan Berdeen has been doing some cool things with Flash and the Echo Nest.   He’s been making it the Echo Nest track analysis work with audio mixing functionality of Flash 10, effectively giving remix capabilities to the Flash programmer.  He’s put together a simple demo that lets you upload a track and perform some manipulations of it.  Check it out here:  Flash Remix Demo (and the source is here). The demo uses Ryan’s new Echo Nest Flash API. Cool Stuff!