iPhone 4S goes on sale today...

Apple Inc. (AAPL). The company’s latest iPhone went on sale in stores across the globe, with fans snapping up the final gadget unveiled during Steve Jobs' lifetime, many buying the phone as a tribute to the former Apple boss. Separately, a U.S. judge said that Samsung Electronic's Galaxy tablets infringe Apple Inc's iPad patents, but added that Apple has a problem establishing the validity of its patents in the latest courtroom face-off between the technology giants.