“Timing the market has fascinated, frustrated, and confused the heck out of countless investors. Whether you’re a self-directed trader or a professional money manager, it’s very likely you’ve found yourself looking through charts, thinking: if only I could’ve had a piece of that trend! While it’s true that past performance is no guarantee of future returns, there is still a great deal of insights to be extracted from analyzing past booms and busts on Wall Street [see A Brief History of ETF Bubbles]. Below we take a stroll down memory lane with perfect hindsight and look at some of the best ETF trades of all time, highlighting their performance as well as any noteworthy lessons from each case.”
http://finance.yahoo.com/news/10-best-etf-trades-time-110039184.html