While it still trails market share leaders Barclays, State Street and Vanguard Group in terms of assets under management, PowerShares Capital Management made a great deal of noise in the exchange-traded funds sector this year; but experts are unsure whether the Wheaton, Ill.-based group can build upon its frenetic product push.

Just 16 months old, PowerShares grew its assets under management in 2005 from a modest $280 million to more than $3 billion and added 32 new ETFs, which represents more products than what is offered by its competition combined.

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