The online brokerage world changed dramatically last year after every major firm eliminated commissions and powerhouses Charles Schwab and TD Ameritrade announced a merger. Now investors are wondering: where that leaves E-Trade? E-Trade (ETFC), which reported its fourth quarter earnings after the closing bell Thursday, now must figure out how to make up that chunk of revenue that evaporated. It won't be easy. Earnings per share fell nearly 30% from a year ago -- worse than Wall Street's forecasts. Overall revenue was down 8%, but that was not as bad as analysts were expecting. Still, commissions revenue plunged 54% ... (full story)