blamm: EXTM3U has the track name and length in it for each track (which is all I need really).
Depends what you want to do with it. I have a ton of FLACs and OGGs that Fireplay wont touch and am hoping this would allow me to browse and stream them through Foobar. To browse I need Album and Artist as well. XSPF will give me this. M3U would require me to stream each one first.