There are plenty of unloved dividend stocks out there that are still worth buying, even as the market flirts with all-time highs.The S&P 500 index (^GSPC 0.49%) is near all-time highs again, with some on Wall Street worrying that the market's valuation has become stretched.But don't despair -- if you look past the major averages, you can still find attractive dividend stocks. Three that are favorites of mine today are Realty Income (O 0.17%), PepsiCo (PEP 0.77%), and Hershey (HSY 0.52%).Here's why. 1. Realt ...