Its not just the dimensions and weight of MP3 players thats going down, its becoming increasingly cheaper to buy players which feature more memory capacity while keeping costs low. Check out the Live CA F280 for example. With a mere 12 mm of thickness, the 19 gram MP3 player is so light that it can be easily slipped into the pockets without a thought of it being inconvenient. A USB port in the device makes it easy to transfer music to and fro. Music files supported include WMA, WAV, ASF and OGG besides MP3. The CA-F280 operates on Lithium Polymer batterues which give a more than sufficient 10 hour of playing time.