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)
pawnme: Of course not, there is no magic in programming (well, "Technology, no matter how primitive, is magic to those who don't understand it.") - so even if a program does not prexist it is not difficult to write one. Write a good one? Another matter!
Writing a good program to play any skilled game is skilled in itself, though, so I think is no where near as bad as using someone elses tool to play games without informing people.