Here, too, is my Cow review of AJA's new, light-weight ProRes field recorder. A very straight-forward piece of gear that you can set up and use without looking at a manual. It records in the high-end ProRes codec, which is especially nice if you use Final Cut Pro (no transcoding necessary, Final Cut takes ProRes natively). It's heavier than a nanoFlash, and uses a fair amount more battery power, but costs several hundred dollars less.
Here's the review on Creative Cow.