Sony has come a long way since the release of the NW-MS11 Network Walkman. One of the company's first flash-based MP3 players, the NW-MS11 didn't even play MP3s and was crippled by copy-protection woes and painfully slow transcoding, but even back then, Walkmans were a model of sleek design and excellent sound quality. The S-Series Walkman is a prime example of the reason Sony was the original king of portable music devices. The flash player, which comes in 4GB ($149.99) and 8GB ($179.99) models, is sleek, compact, easy to use, and packed with features. Plus, it sounds great and has an impressive battery life--we just wish we could get more than the 8GB of memory. Read the full S-Series Walkman review.