Hey, as i tend to play both single and multiplayer at the same time, i´d like to see an easier way to switch back and forth between games. I´ve no idea how the new mac game center is intended to work, but first impressions tells me huge updates are coming

But, over to welder:
At the moment ,it takes about 6 clicks to get from single- to multiplayer.

Suggestion : When you´re in singleplayer mode, a light turns on in the left sidepanel (either conventional or slooowly pulsing),
and clicking it switches over to your multiplayer-turn.
Preferably just the gameboard changes and the "application frame" gets a darker color. I picture the gameboard flipping on hinges in the application frame when going back and forth.