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WHEN SEARCHING FOR EXTRA INVESTMENT income, it's reassuring to know that something always works well. When, as now, interest rates are up and there's talk of increased inflation, the timing is wrong for traditional income investments, such as Treasury bonds. Interest rates on bank deposits have been rising, but they're still not much higher than the rate of inflation. Fortunately, there's a smorgasbord of liquid investments that yield 6% or more, with some of them posting double-digit returns. And there's a possible bonus: If the economy or a particular sector prospers, your principal and the monthly or quarterly dividends could grow.

There's ...