(Parry is "The Privacy Lawyer" for Information Week and has called for the creation of a "Data Map" to manage privacy.)
I enjoyed your article "It's time to build a data map." I have referenced it favorably on my weblog www.erp4it.com.
My perspective is that what you call for should not be done episodically (e.g. through a periodic audit process) but rather should be intrinsic in how the IT organization is managed...