Different classes of stock is the Google and FB way, IIRC.
http://blogs.wsj.com/deals/2012/02/01/at-facebook-governance...
http://blogs.wsj.com/deals/2012/02/01/at-facebook-governance...
On the other hand, you dilute power between an array of smart talented people. Any action requires consensus. In the best case, you get congress when passing a "think of the children" resolution. In the worst case, you get congress with pretty much any other piece of legislation.