For posting: - invitations to games (you can also use the New Game menu or go straight to the Chess Invitation) - 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)
...and it is freeware, I have it too on my pc :).
Try also http://www.playwitharena.com/ for another good chess-application (like winboard)
...and in chesslab you can find some of my tournement games :)