Has anyone solved their LR4 / Nikon D800 RAW NEF issues?

Question

I've done a lot of reading on this topic and think I have a handle on how easily the new D800 NEF files can be corrupted by the older versions of Nikon Transfer.
When I began using the camera I accidently made the mistake of corrupting them and haven't had any issues since... until yesterday.
I photographed last night, and imported about 160 RAW NEF files onto my brand new Macbook Pro with Retina for a same day preview for the host.  I transfered the images using ViewNX2 & by association it's built-in Nikon Transfer 2 utility. I used the built in SD Card reader on the Macbook which has always worked in the past.  But alas!!!!!  While they imported fine, LR4 can't import them and gives me the error "Preview Unavailable at this Time".  I should note... Nikon Transfer 2 was set to clear the card after the transfer .
Nikon ViewNX2 can see the images and I'd hoped to fix the issue by just converting them to JPEG's but, no bueno. It tells me it can't.  This is the precise issue I can into when I accidently used the original version months ago on my iMac.  But it's impossible that I have the old version on this unit.  It's less than a month old and I'd downloaded the most recent version from Nikon.  So I'm running under the assumption that the file is somehow corrupted.
I've seen a lot of people running into issues getting used to the new workflow requied to deal with these enormous RAW's.
Here's the all important question. After the files have an issue... is there anyway to recover them???  I can't retake them, the original shots were wiped from the card. So what do I do?  At least Nikon View can see them, so I have to believe that there is some image information there.
Has anyone sucessfully fixed the issue?
Going forward I plan to just import everything directly through LR4, so I think that'll aliviate future heartburn... but what's my "undo" solution?
I know there's a lot that's been written on this topic and really appriciate the support!
-Jared

Answer 1

What Bob Frost just posted (after fixing the hidden http// part of the URL) worked for the image you uploaded, so try that:
http://owl.phy.queensu.ca/~phil/exiftool/fix_corrupted_nef.html
BTW, I answered 14 to the bit-depth-12-or-14 question the utility asked, and it worked ok on the example corrupted NEF.
Below is what I was typing up and testing before posting, and works to extract the embedded JPG Preview, but does not actually fix the corrupted NEFs, which is a better solution.  I am including it, below, for reference in case someone without corrupted NEFs also wants to extract JPGs from their raw files.  It uses the same tool from Phil Harvey without his customizations to work specifically with corrupted NEFs.
== Original Message ==
The raw data in the NEF you uploaded appears corrupted or otherwise unusable because when viewing in Windows Explorer using the latest Nikon NEF Codec that supports the D800, all I see is a small thumbnail then black with a few parts of color, however for that one file, at least, the embedded JPG preview is intact, and 7360 x 4912 in size, enough to see the camera-shake blur. 
https://dl.dropbox.com/u/9905000/JBR_20120910_175757.jpg
I’m on a PC and you’re on a Mac but the same tool is available - exiftool a command-line program you run in terminal (on a Mac) or in a Command Prompt window on a PC:
http://owl.phy.queensu.ca/~phil/exiftool/
If what you download includes a (-k) then remove it by renaming before attempting to run the command, below.  On Windows I would rename exiftool(-k).exe to exiftool.exe without the (–k) part.  The (-k) tells exiftool to display the exif information by default if you drag-and-drop to it.  While this is normally useful, for the purpose of extracting JPGs from NEFs this might be confusing so I’m suggesting to rename the executable before using it.
Here is the command-line to extract the fullsize JPG from the NEFs and then copy the metadata tags from the NEF to the newly written JPG:
.\exiftool -b -JpgFromRaw -w %d%f_%ue.jpg -execute -tagsfromfile @ -srcfile %d%f_%ue.jpg -overwrite_original -common_args --ext jpg .
The above command assumes both the exiftool executable and all the NEFs are in the current folder.  The current folder is designated by a single period both at the very beginning and the very end of the command-line.  If exiftool is in a different folder, then supply that path instead of the initial period, and if the NEFs are in a different folder, substitute that folder-name for the final period.  The final period has a space separating it from the preceding –ext jpg. 
It is also assumed that only NEFs and the executable are in the current folder.  If there are other files, they may confuse things so you might want to move things to a temporary working folder, and I’d suggest working with a copy of the NEFs just in case something goes haywire, you’re not overwriting the originals, corrupt as they may be.
For reference, the above command-line was simplified from a more complex example that didn’t quite work with your file, one that conditionally extracts either the full-size JPG or the tiny JPG-thumbnail.  The example is the last one in the Copying Examples section, here:
http://owl.phy.queensu.ca/~phil/exiftool/exiftool_pod.html#copying_examples