Check out the kawauMicro USB Music Playe which is a tiny MP3 player shaped like a USB memory stick.

The kawauMicro USB Music Player comes with a built in rechargeable lithium ion battery, and can take microSD and microSDHC memory cards, it measures 55 x 20 x 10mm and weighs just 10g.

Here are the specifications.

• Fully support USB 2.0
• U disk functions without driver installation
• Directly upload or download the MP3/WMA files into microSDHC, microSD memory card
• Built-in rechargeable lithium ion battery
• Provide 2 hours playing time
• Fully charging time: Approx. 30 minutes
• Play/Pause, On/Off, Vol+, Vol-, Next, Prev control, LED indicator
• Earphone output: 5mW+5mW stereo
• Signal noise ratio: 85dB
• Support MP3/WMA format audio file playing
• Support microSD 32MB-2GB, microSDHC 4GB-32GB
• Support Windows Vista, XP, 2000, Me
• Dimension: 55 x 20 x 10 (approx.)
• Weight: 10g

The kawauMicro USB Music Player is available for $16 from USB Geek.