The investment world's love affair with all things ETF did not wane in 2010, as their share of the market rose to $940 billion. But popular doesn't mean easy, and it doesn't always mean profitable. Along with the best and the worst performers, a few reminders about how to use these popular investment vehicles safely.
Exchange-Traded Funds that use derivatives -- or products such as options that derive their value from other instruments -- are probably among the most complex investments. Small wonder then that securities regulators are warning investors of the risks with these inverse and leveraged ETFs.