ETFs vs. Classic Index Mututal Funds

Fund managers love the ETF (exchange-traded funds). But what's in it for the investor? Vanguard founder John Bogle expresses his skepticism of ETFs in today's WSJ:

So long as the truism that "the more financial intermediaries take, the less their clients make" remains in effect, serious and intelligent investors ought to beware of moving their investments out of classic index funds focused on low costs, broad diversification and long-term, buy-and-hold strategies into index funds nouveau (ETFs), with their overlay of costs, limited diversification and short-term trading strategies. Industry participants, too, should be concerned. For in the long run, any business that puts the interest of service to self before service to clients will ultimately pay for this contradiction.