We've come a long way since the 5GB iPod. Today, you can find pocket-size video players, MP3 players with tiny flash drives offering up to 32GB capacities, even digital audio players built into sunglasses. But one of the most advanced features you can find in today's MP3 players is wireless capability. This is generally split into two categories: Bluetooth and Wi-Fi. Wi-Fi is the subject here, and the devices that incorporate it represent the cutting edge in MP3 players.