For posting:
- invitations to games (you can also use the New Game menu)
- information about upcoming tournaments
- discussion of games (please limit this to completed games or discussion on how a game has arrived at a certain position ... speculation on who has an advantage or the benefits of potential moves is not permitted)
- links to interesting related sites (non-promotional)
redsales: I would probably say that in grey chess, not all the moves should be shown to the opponent. For example every three moves or every five moves. Now I think it'll be interesting.