So far what nations look strong... and weak?

[licker]

A problem with the checkerboard approach though is supply. Without the connections to your depots and the increased consumption of the fliers it will start to hamper you once your armies begin to get sizeable. (and it doesn't take many fliers for that to happen...)

Its still a good approach though, especially when your opponent really isn't prepared for it. You can also use it to wreck your opponents supply lines...