Junk-bond ETFs boom as investors crave income By: MarketWatch August 22, 2010 at 12:01 PM EDT Investors fed up with U.S. stocks are piling into exchange-traded funds that invest in high-yield corporate bonds. Read More >> Related Stocks: High Yield Corp Bond Ishares Iboxx $ ETF Invst Grade Corp Bond Ishares Iboxx $ ETF JNK