kidder - 5:54 am on Feb 16, 2010 (gmt 0)
That is an interesting idea, you can of course setup Geo targeting in GWT, I never thought about the idea of a total block but I'm sure its possible. I would be looking at the server option rather than the Google option. People will find your site in more ways than just Google. I guess a lot of comments spam etc gets outsourced to certain poorer countries so it might be an interesting experiment. I have a friend here in Australia is blocking everything he can from outside AU to stop credit card fraud on his membership site.