Will I have to work shifts? permission pebble loan decision online hooker female Comcast Corp gave the S&P 500 its biggest boostafter the U.S. cable provider posted a higher quarterly profiton Wednesday, as it added more Internet customers than expectedon the cable side and booked an increase of more than 20 percentin operating cash flow at its NBC Universal unit. Comcast'sClass A stock rose 5.6 percent to close at $45.08.