[swooshycueb]

Something I just found: the stream urls have an "at" or "ap" just before audio.wma. at is a full track, and ap is a 30-sec preview. Example:

Full track:
mms://stream.zune.net/a4241/e3/109/711/767/at/audio.wma#0;1.000;0;0;1:2

30-sec preview:
mms://stream.zune.net/a4241/e3/109/711/767/ap/audio.wma#0;1.000;0;0;1:2