The S&P 500 index (^GSPC 0.70%) is yielding just 1.3% today. The average real estate investment trust (REIT) is offering a 4.1% yield. Realty Income's (O 1.63%) dividend yield is a far more compelling 5.8%. That high yield, however, isn't the best part of the story. The really important thing to know about Realty Income has to do with the strength of its business. Here's why you'll love Realty Income if you are looking for reliable dividend stocks.Dividend stocks: The first step isn't the only stepFinding h ...