http://www.newgrounds.com/bbs/topic/87 6874
EDIT: They changed it back, everything's cool.
Basically, now anyone can make money off of your songs without paying you! If you've submitted music to NG, this is a big deal and a huge blunder on NGs' part. Musicians deserve to get something when someone makes money off of their songs!
I'm gonna delete my songs if this change is permanent. Guys, PM the administrators and tell them to change it back to Attribution, Non-Commercial, Share-Alike!
WritersBlock
I don't have a lot of stuff that'd be usable in commercial situations, so I'll probably keep my stuff on here, except I won't put up any of the awesome stuff I've just started making...
It's kind of weird how Tom said that this new license was meant to be implemented from the start... so it wasn't an accident, but it looks like it'll drive away a fair few musicians...