I posted something similar in another thread, but this is a request (suggestions) for improved communication within games. The purpose of this functionality would allow communication similar to what could be accomplished in a face-to-face game of Diplomacy.
Requests (Suggestions):
(1) Allow everyone in the game to know which players sent messages to which other players. Perhaps this could be included in the move history section, or a new tab could be added for communication history. The contents of the messages sent between other players would not be known, but a list of who communicated with who would be displayed. For example, if Russia sent a message to France during the Spring 1904 turn, then the following would be displayed: "Spring 1904: Russia sent a message to France". In a face-to-face version of Diplomacy, normally a player could see who was discussing with who, even if the contents of that discussion was unknown.
(2) Allow for messages to be sent to multiple players at the same time. Perhaps add an "inlcude" tab that allows to select additional players to send a message to. When someone receives a message that was also sent to other players, it could include a comment such as "this message also sent to [xxx]", where [xxx] is the list other countries the message were sent to. This would allow for group discussion that includes some countries and excludes others.
The above should be easy to code, don't change any rules of the game, and allow for interaction similar to a face-to-face game. This is different from the Global Chat feature planned for version 0.8.