So it seems the playlist thing has been working badly, if at all. I played around with it a bit this morning while drinking my coffee and ironed out a few glitches.

...not that I'm saying it will work now, but it (at least) is playing the whole playlist through now rather than stopping after the first track and waiting for you to press advance(or whatever). Turns out I wasn't sending the Content-Length MIME header.. if yer interested :)