Gizmodo blogs about the new Samson Zoom H-4 field recorder, which seems extremely promising. At only $300, it is about $100 less expensive than either the Edirol R-09 (which is what I have) or the Microtrack 24/96 (which is very popular). The interface for the Samson looks absolutely fantastic and it has two XLR balanced inputs, which none of its competitors have.
The mike placement of the Samson is a spitting image of the Sony PCM-D1, which costs about $2000. The X-Y configuration is designed to give you a better sound field by reducing the possibility of the stereo mics being out of phase with each other.
Samson's product home page is here and they also have a copy of the manual online, which gives some of its specs. After the jump is a comparison of the Samson H4 against the Edirol R-09. The main defect that I can see is the lack of a time/date stamp on the files. This makes it much harder to use as a field recorder -- or as the audio component of a dual-system video recorder.
I'm thinking of picking one up as it seems very promising. No one has it in stock yet though. There are also only a few reviews online, but check the video review on Neo-Fight.tv.