Citigroup CEO Vikram Pandit calls it quits. From Pandit's legacy to challenges facing Citi's new boss. The resignation is one of the biggest surprises on Wall Street this year. Two tech titans report better than expected results but both stocks fall in after-hours trading. NBR's Ruben Ramirez runs down the numbers and what the future may look like for IBM and Intel. Student loan servicers get an "F" from regulators who complain school loans are handled a lot like the sub-prime mortgage market. NBR's Sylvia Hall has more from Washington.