SONY's new digital audio players, E-Series, look exactly like USB keys.
They feature OLED color screens, 1, 2 or 4 GB of space, integrated CLEAR AUDIO technology and Direct USB so you can use them as a regular USB tools. With these DAPs you get aproximately 30 hours of continual playback.
The devices measure 22.4x82.9x13.6mm and weigh only 29g.