I started a group on Linked In (a professional networking site) for educators interested in teaching with Scratch.
http://www.linkedin.com/groups?homeNewMember=&gid=2339178&trk=eml-grp-sub
While I definitely think that Scratched should be the hub for discussions directly related to Scratch, Linked In seems to offer additional opportunities for professional networking. Linked in is a website that helps people make and manage professional contacts. This gives a more detailed intro to it: http://press.linkedin.com/
Best,
Rick