The Sony NWMS11, which now includes the 128MB version of Memory Stick, Sony's proprietary removable storage medium, is good for around 160 minutes of music. The accompanying software encodes music in Sony's preferred ATRAC format and places restrictions on the number of copies you can make via a system that forces you to "check" music in and out as you move it from PC to player. That aside, listening results are excellent, controls are easy to use and effective, the price of the drop-in Memory Stick makes the products that use them increasingly attractive and it is tiny, tiny, tiny.