More than half of mutual fund investors don't know the difference between a mutual fund and an exchange-traded fund, but a recent survey found that many investors are interested in learning more about them and would consider buying ETFs if their financial adviser suggested it.

So, while ETFs have burgeoned from one fund with $464 million in assets in 1993 to 359 funds with $423 billion at the end of 2006, their popularity has room for even faster growth.

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