I think it is ok I made mention of it for those involved in the Community and Comms discussions.
In general, this is what I think:
CKAN users - talking over the google group surrounding end user adoption, and feedback from those using it. It is also something of an announce list for things like CKAN updates or calls for participation in things like CKANcon.
CKAN dev - used for specific support and bug discussions. Its assumed that these are people actively building and supporting CKAN environments and/or extensions. Although, it is somewhat over used for support as the infomation would have much more value to the wider dev audience if it was in a discoverable forum. In the past this was encouraged and I suspect it will be again in the near future.
CKAN discussions here - I think the discussions here will be valuable to help people evaluate whether CKAN is the right tool for their OKFN related initiatives. The topics might be higher level and relate to managing open data policy, custodians and engagement with technical communities (such as hacks or challenges). Particularly relevant for the Community and Comms team it would be a great way to broaden the message of CKAN being open source and open to innovation which directly supports NGO, Government and Civic oriented private sector initiatives.