The year 2008, so far, has been anything but smooth sailing for investors. In this period of volatility, it might be nice to know what ETFs hold up well during crazy times.How can one achieve some degree of stability without exiting the market completely and risking missing the boat to financial recovery? One way is to seek out stocks with defensive characteristics. To simplify the approach and optimize diversity, investors might want to turn to ETFs that also subscribe to this line of thinking. For specific picks, we turned to Eric Bolling, a television personality and trader who has served as a strategic adviser and board member at Nymex Holdings ( NMX). Bolling named three ETFs he thinks would best serve investors who are looking to get defensive: iShares Dow Jones Select Dividend Index ( DVY), PowerShares International Dividend Achievers ( PID) and Consumer Staples Select Sector SPDR ( XLP).