Well there is a playlist option, they can be created by both the audience and the Author, however i do agree it needs more works before it could become something feature worthy, maybe a nice idea would be to add an album features, so NG could front-page collections every week or month.
Also those are some great news, knowing that you do plan on making an animation on that stile, i know that when you do it is going to be incredible.
Doomroar
Oh you are in soundcloud? i have been thinking about making an account just to follow some musicians there, but i am too lazy for it XD, however Burn7 recently announced that he was migrating to that place (http://burn7.newgrounds.com/news/post/886688), and man does that made me think, i wonder if Tom has any plans to revitalize the audio portal, we know that Jazza is pretty much covering the art portal attracting people to that feature but, could there be any similar plans with the audio one? i have no idea.
Fantishow
Yeah, I haven't been posting audio on here too much because of the lack of features. It's kind of a hastle to convert all of my audio to .mp3, and a playlist option for EP's or albums I feel would create a motivation for large scale creativity.
Just thinkin' out loud.