Steno Gadgets & Accessories: Zoom H2 Recorder
The Zoom H2 has some handy features such as: Four microphones that can record on two or four channels, an automatic recording function that can be activated by voice or decibel level, compressors, low-cut filters, MP3 or WAV format recording, WAV to MP3 converter, metronome, and tuner.
This recorder has always given me quality recordings. Just be sure to keep extra batteries around if you plan to use it for extensive time periods. (Note: It also comes with a plug-in power cord.)