The Center for Democracy and Technology has released two handy tables that illustrate the privacy law patchwork that exists in the United States. The first covers Commercial Access and Use while the second deals with Government Access and Use.
Privacy Rules For Access To Personal Data:
"....CDT has been researching the federal privacy laws and how they might affect data access and analysis by government agencies for counter-terrorism purposes. We have compiled this resource to present these laws in a way that will be readily accessible to non-lawyers but also have depth, reflecting the complexities and nuances of the existing 'patchwork' approach to privacy...."