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miceblue said:

When recording with binaural microphones, I'm guessing the placement of the microphones makes a difference? (i.e. microphones 1 meter apart will sound different from microphones 15 cm apart)

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Binaural recording requires the mics be spaced at the distance of a set of ears on a head.  You wouldn't be doing binaural recording with mics at 1 meter apart. It only works with the exact inter aural spacing.  
 
This isn't written very well, or even very complete, but it's a start:
http://en.wikipedia.org/wiki/Binaural_recording
 
This is a sort of resource page:
http://www.pugetsoundman.com/articles/stereo/binaural.htm
 
And now you can go do your own Googling!

ronion said:

They are unfortunately difficult to carry around.

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Thats correct but you can record their output via toslink and play it on any dap on the go and have a feeling you are listening to 200000$ loudspeakers.

Now that's an interesting idea! Genius. That will require some work to get it right, but it's certainly doable!