The used at the recent workshop I attended was the Marantz PMD660.
The is small enough to fit in the palm of your hand, but it has features that make more expensive, full-sized field recorders green with envy. It can run for hours on just four AA batteries. It records on Compact Flash media cards which you can find in any discount store, and will store more than 36 hours of mono on a single card. If audio quality is your key requirement, you get over an hour of pristine, uncompressed, 16-bit .wav files. Editing can be achieved right there in the field using either of two editing modes, or you can use your favorite audio editing application by transferring files to your PC-the PMD660 even has its own USB port. XLR inputs, phantom power, built-in mics and more-it’s all there in the PMD660.
Highlights
Smallest PMD yet-fits in your hand
Records uncompressed 16-bit PCM .wav files at 44.1 kHz or 48 kHz
Records mono .mp3 files at 64 kbps
Records stereo .mp3 files at 128 kbps
Uses inexpensive, widely available Compact Flash media (CF)
1 GB CF card can hold over 1 hour of uncompressed stereo
1 GB CF card can hold over 17 hours (stereo) or 36 hours (mono) .mp3
Operates for four hours on four AA batteries
Two XLR mic connections with +48v phantom power
Two built-in condenser mics for easy, true stereo recordings
Stereo line I/O
Solid State Design
No moving parts-no maintenance.