Let me first start with explaining the group is related to Knosos project (see website) where we investigate the whole concept idea in a brotherly way. There is a small team of developers, a research team and a commision of industries. The project started in September 2005 and will go on until September 2007. We have the opportunity to do a sprint on the idea of knowledge sharing and with this group we would like to open and support the debate to for the Drupal community.
Since this is the first post I would like bring in some more introduction material. In our project we (mostly form Tangy's PhD) see knowledge sharing is a 3-level conceptual system: Identify space, dyadic space and group space, for more information on it, see the website. At FOSDEM 2006 I had a very interesting discussion with Ivan (Labra) and Boris (Mann) about the 3-L concept to figure out there are actually 5-L on the developers side (a extra cross layer and the admin layer).

Comments
conceptual discussion
As you may notice we are creating quit some concepts (radar, publish-option, etc). We would be nice to debate on the whole conceptualisation. For example at the moment og creates groups as nodes. I have been talking to Durpal people about it and there seams to be a debate if everything should be a node or not. I can understand that some node-api function would be interesting for other purposes than content creation. I would like to open the debate to the layers, so not only groups but also users. It clearly would be nice to have some of the functions in nodes, but groups are not content on its own. I would like to keep an open mind, maybe we should split nodes in something about content (so you need revision etc.) and function related to structure (like groups and users, but also content).
As way to get some grip on the problem domain I have create groups as users, it is just some testing, I'm not making any of the function existing in og (like themes, pictures etc). It is just, when you don't understand a problem something is missing and what better way than to lure the beast our of its cave as to get into the cave. At the moment the test didn't bring a lot of clarity, probably because all the other stuff needed to be done, but I don't want to wait to long, we should have one group module in the future. So to get consensus lets start testing a bit.
Content + Structure
http://homepages.vub.ac.be/~eimatthy/CMap/Nodes.html
Is this how you, for example, could interprete this?
not about rating
I know we are having an interesting discussion at the moment about rating in our research meetings, but I don't think the rating is a issue here. Now I should mention the intention of the group is to discuss how we transform functions of the social networking system and other systems of knowledge sharing to a Drupal approach. I'm having this discussion quit a lot with other people of our knosos-team, there is a big difference between user-oriented concept and development-oriented concepts.