Online financial services firm E*Trade Financial ( ET) reported a 54% jump in second-quarter profits, fueled by big gains in commission revenue and interest income. In the quarter, E*Trade earned $156.5 million, or 36 cents a share, including a charge of 1 cent a share for acquisitions, up from $101.6 million, or 27 cents a share. Net revenue surged 58% to $611 million. Analysts, most of whom excluded the acquisition expense, were forecasting earnings of 35 cents a share on revenue of $596 million, according to Thomson First Call. E*Trade's strong results were similar to the better-than-expected earnings posted by its online rival TDAmeritrade ( ATMD). The two big online brokers showed few ill effects from the stock market turmoil of the past few months. Indeed, if anything, it appears the volatility in the markets has been good for the online firms. Revenue from trading commissions rose 68% in the quarter to $167 million. Net interest income, most of which is generated by E*Trade's online bank, rose 6% to $344.6 million. E*Trade also raised its full-year earnings guidance. The firm now expects operating earnings, which exclude acquisition-related charges, to range between $1.42 to $1.52 a share. The consensus forecast before the new guidance had E*Trade earning $1.43 a share on an operating basis. Shares of E*Trade, in after-hours trading, were up 34 cents, or 1.5%, to $22.75. The stock closed Wednesday at $22.41.