Collin Donnell has the right idea. Glassboard is just public enough to be inclusive but it's not so public that it smells like a dung heap.
I was thinking it would be cool if there was a slightly less public way for all of the productivity nerds out there to share and discuss ideas than posting publicly on the Internet, so I’ve created a Glassboard for anyone who’s interested.
Since Collin Donnell owns the board, he can kick anyone off. It's the rebirth of the BBS. I joined.