Visits to music downloading Web sites saw a 50 percent rise on Christmas Day as hundreds of thousands of people began loading songs on to the iPods they received as presents. According to Hitwise, the online intelligence company, iTunes music store saw a 50% rise in traffic between December 24 and 25. Weekly downloads already exceed 650,000 and may pass the 1 million mark for the first time this holiday season. Analysts believe 37 million iPods will be shipped by Apple worldwide by year end, with 10 million sold in key Christmas quarter
