If I sign a non-disclosure agreement with a company, third-party,
employer, etc. am I legally allowed to disclose to my wife anything
confidential between me and the third-party?  Barring a discussion of
whether this is ethical or not, is it legal?  Furthermore, I know that
spousal privilege prevents my wife from being coerced to disclose
anything I have told her in private, so the issue may be a moot point,
but I wanted to know about it's legality.  Does disclosing
confidential information to my wife technically break an NDA?

A couple of caveats:
1. I, of all people, understand that Google Answers cannot be held
liable for legal advice, so consider your answer already disclaimed.

2. This has nothing to do with a current or historical situation; I am
merely theoretically curious and don't have the patience to peruse the
web to find out.

Hello Grammatoncleric,

Here's an article on the subject:

"Do You Talk Too Much?"
IEEE Engineering in Medicine and Biology Magazine #3, pg. 74 (September 1991)
http://biotech.law.lsu.edu/IEEE/ieee05.htm
From:
"Scientific Misconduct and Research Fraud"
 by Charles Walter, Ph.D., J.D. and Edward P. Richards III, J.D., M.P.H.
http://biotech.law.lsu.edu/IEEE/p2.htm

Note that the case discussed in "Do You Talk Too Much?" is fictitious.
However, the basic point is sound, at least theoretically.  Disclosing
your employer's trade secrets to your wife could indeed violate your
NDA. Confidential means confidential.

Juggler,

Thank you for your comment.  I find your reference, although sound, to
be problematic, because the ficitious story plots the husband telling
his wife the trade secrets in a public setting.  Naturally, this could
also void the interspousal privilege (the lack of wisdom from talking
in a public place aside).

-grammatoncleric