Federal-Level Domains in the U.S.?

A few brief questions for my favorite W3C Interest Group. :)

How far away are we from being able to traverse a web page, BusinessA.com, and, no matter how eloquent its marketing face may appear, be able to run a background check on the company by simply changing the URL to BusinessA.epa, BusinessA.law, BusinessA.sec, or BusinessA.hhs?

How far away are we from utilizing a web browser to record my traversals of BusinessA.com, BusinessB.com, and BusinessC.net, and be able to view in the left or right side chrome of my browser a visual aggregation from data catalogs residing on each business' federal mirror sites, such as .epa, .law, .sec, and .hhs?  

This sort of aggregation could point me in the direction of the business I'd be most enthusiastic about doing business with, while giving me a better sense of what kind of business these companies are conducting in the aspect of public records. 

It it feasible to parse all of the data on sites like data.gov into datasets attributed to businesses while binding them near the domains upon which these businesses reside?  If so, it could offer a wealth of opportunity for all of the stakeholders in the field--government agencies, consumers/civilians, and businesses vying to enrich their integrity--especially if it effects their bottom line--over that of their competitors. 
 
Michael A. Norton