The Web Services Working Group is a Production Working Group.
Create a POC using com_users by using the extending it to add webservices to Adding, Editing users, Listing users. Added by Parth Lawate as per webservices group discussion at #JWC12
Primary communications channel is the Joomla CMS Development mailing list. If the volume of traffic becomes such that it might be deemed to be a nuisance by those not interested in web services, then we will most likely start a separate mailing list.
There is also a Skype chat for informal communications. Please request to be added by contacting Ashwin Date or Chris Davenport.