The Tascam DR-40 Audio Recorder is a small, compact, high quality digital audio recorder that captures in WAV format for use in high-end productions. With abilities to record to built-in stereo mics or to external XLR microphones in up to 4 tracks. It uses SD card flash storage and has a USB port to connect to a computer.
B&H Photo has a fairly detailed review:
Tascam DR-40 Audio Recorder – available from B&H Photo Video