A great resource for investors is http://www.seekingalpha.com/. Here's an article by Zacks Investment Research that summarized the stock market returns for 2011 by country. The US is at the top of the list. Next year will probably be better for the US market as some of the uncertainty in Europe subsides.

The US consumer is spending again and driving our modest economic improvement.

http://seekingalpha.com/article/316799-2011-stock-market-returns-by-country?source=email_macro_view&ifp=1