I am asked on occasion about investing overseas in both established markets and emerging markets.
While it is tempting to invest in markets such as China, India, Brazil, Korea etc, it is also quite risky.
Besides the obvious risk inherent to investing in companies in countries outside the US that have much less stringent reporting requirements, there is also a currency risk.
The news lately has centered around established countries within the Euro zone and that has turned out to be a very dangerous place to invest.
I tell people that when you invest in a broad based US index fund, see VTI, then you are already getting some international and emerging market exposure since the companies within such as Caterpillar, IBM, McDonald's, Exxon & GE are already investing in those countries.