As part of its CES campaign, Sony on Wednesday updated the Walkman line with two models that enter uncharted territory for the company. The Walkman NWZ-X1000 is its first touchscreen media player in North America and aims squarely at the same field as Apple's iPod touch or the Samsung P3. The player claims a much more vivid picture through a 3-inch OLED touchscreen which is both more color-rich