Paul,
I decided to give this a go and ran into a few issues...
The interface doesn't look like the video (I'm guessing you've prettied it up a little?)
The expected directory doesn't exist (audiofiles) -- I created it and put some files in there but still no luck.
The "download zip" option on github seems to leave jplayer and getID3 folders empty. Maybe if I properly "pull" this I'd have a different result, but I'm guessing that users will mostly just download this and wonder why it doesn't work.
My development server is running on an aged Ubuntu 10.04 server *hangs head in shame* -- so that may be part of the issue, or my horrible lack of know-how on a linux box.
I can show you folder structure or send screenshots if you feel like helping. I doubt I'll put much time into it, but thought I'd offer some feedback since you offered the code so kindly.
nc