We have a mailing list open to anyone interested in EHSM.
post: list AT ehsm.eu
subscribe: write to list-request AT ehsm.eu with "subscribe" in the subject line
unsubscribe: write to list-request AT ehsm.eu with "subscribe" in the subject line
The mailing list has public archives.
We also have a IRC channel: channel #ehsm on the Freenode network - connect with your browser.
Finally, you can follow us on twitter.