The Sony S2 Sports is targeted towards avid joggers and outdoorsmen who want to listen to their music in all weather conditions.
NW-HD1 was supposed to be Sony's answer to the iPod. It flopped mainly because it didn't have native support for MP3 files. In order to play music, it has to convert all of your audio files to ATRAC3, Sony's proprietary format.
VAIO Pocket is an expensive music player/photo viewer with a 2.2-inch color display. Its lack of native MP3 support and high price point draw it back considerably in respect to the competition
