I sent in my membership today to the American Music Center (http://www.amc.net/)
I've been meaning to for quite a while (no doubt the reason I took out a 2 year membership!) and had told Augusta Read Thomas that I would (when we interviewed for 20/20 Hearing she had told me she was the president-elect. Now mind I had good intentions before Gusty told me that!)
The AMC are the folks who own and manage NewMusicBox besides many other great resources for composers. Do yourself and new music a favor, join up too!!!
Tell 'em John sent you. John Cage that is. Or Augusta Read Thomas, whatever or whoever, just, as that certain sports gear company would say, do it!