Info: Portable Digital Audio Flash Memory Recorders compared

Core-Sound.com has a comprehensive review of various flash-memory based field recorders. They cover the: CoreSound PDAudio, Marantz PMD670, Marantz PMD671, Sound Devices 722, Fostex FR-2, M-Audio MicroTrack 24/96, Edirol R-1.

Now, CoreSound makes the PDAudio, so take some of their qualitative comments with a grain of salt. It's also considerably more expensive than the other solutions at around $1500. Check my older blog articles on field recorders.