Sony has been trying very hard to innovate these days, and this effort is clearly evident in its Walkman line of MP3 players. The company's latest addition is the Sony Noise Canceling Walkman NW-S705F. As the name implies, the included in-ear headphones on this model have a distinctive active noise-canceling feature. But unlike other noise-canceling headphones, they're powered by the player's battery rather than by a separate power source. This is a great concept and the implementation is pretty good, although I'm not terribly impressed by the player's controls and software integration.