I'm sorry ... I'm paranoid. phpMUR is closed to the public.
There are a couple of reasons I'm doing this, that I prefer not to go into at this time.
If you really want to see this thing in action you can email erm via the contact form.
You can download the code phpMUR.zip (a little buggy, but it works.) just click populate_playlist() reverse_sync_playlist() trimPlaylist(); at the bottom of the page if something isn't working quite right.
If you would like to contact him via IM