Sony's just amped up its Walkman line with the WH series of headphones, though the term "headphone" fails to capture the essence of the new models. The company's also stuffed a 16GB MP3 player into the high-end NWZ-WH505 and a 4GB unit into the NWZ-WH303, giving you up to 4,000 tracks without any other device. It's also compatible with a Mac, PC and other playback devices via a supplied cable. To top it off, you can take the cans off and flip a switch to turn them into xLoud tech speakers with Virtualphones surround sound. The NWZ-WH505 will deliver 20 hours of 1000mW, 5-25,000Hz headphone playback (30-20,000Hz for the WH303) on a full charge and an hour's worth with a three minute quick charge. As for the speakers, we're not sure how well they'll fill in for a dedicated unit, but it's gotta be better than those on your smartphone, no? Sony's still mum on pricing and availability, but you can hit the source for more info.