Noted for their simplicity and other advantages over mutual funds, exchange-traded funds have become a popular investing tool. ETFs hold a collection of stocks that share certain elements in common, so that if investors want to capitalize on the booming economy in China, for example, they can turn to iShares FTSE/Xinhua China 25 Index (NYSE: FXI ) or PowerShares Golden Dragon Halter (AMEX: PGJ ) , which track two different Chinese stock indexes.
But since these ETFs invest in a number of stocks, they give you a broad










