Main Google group / mailing list (ahashop) - To get on the mailing list, go to this page, click "Join this group" in the right sidebar, and select your desired update frequency.
IRC channel: #allhandsactive on freenode.net
SUBGROUPS (in active use):
ahashop_members - Extra updates for interested parties.
ahashop_noise - "Hey guys, let's go get ice cream before build night!"
ahashop_directors - Publicly archived, moderated discussion list for the Board.
ahashop_fab - 3D printers, laser cutters, mills, CNC routers, etc.
Picasa album - Includes some older pictures.