I've written a number of blog posts on B-Corporations. TriLibrium, the company I founded, is a certified B-Corporation and I believe, the only public accounting firm in the country that has achieved that designation.
Part of the B-Lab (The non-profit supporting the B Community) strategy was the goal to have the B-Corp designation recognized as a distinct legal entity just like C-Corps and S-Corps. Yesterday, Maryland became the first state to pass a law recognizing B-Corporations. You can read more about that in this article.
Wish I could write more but it is April 14th. Have you filed your taxes?