So I was thinking about this earlier, and other people had mentioned the different types of TBS multiplayer types there are out there like hotseat. Then I got to thinking that since SD is going to host all MP games would it be possible to have a play-by-web (pbw) game? Similar to the play by email games, I would imagine that everyone would have to be online for the initial setup of the game, but then people could log off and be notified of when it was their turn to make their moves, log back on, make their moves, log off etc without everyone being online at the same time.
This all came to mind as I was reminded of the posts stating that, at least in single player as I remember, that people could be playing a single game over a period of years (I think it was a reference to the 64-bit version). Either way I think it would be a cool idea, but I didn't know if there were any plans for this anywhere.