Coby MP320-4G USB-Stick MP3 and FM Radio Player with LCD Display (Black) (Discontinued by manufacturer)
The Coby MP320-4G stores and plays both MP3 and WMA audio files.  Big sound, micro size!  It weighs close to nothing, and fits comfortable in your shirt pocket.  With 4GB of memory this player can store up to 1000 songs, comes with a slim and convenient clip design, has an integrated FM radio tuner for access to more songs and talk radio, and has a built-in USB plug (no cables needed).   With the LCD display, you will also know exactly what you're listening to.