Clear example of a net neutrality violation

On Freedom to Tinker today, Ed Felton posted an excellent, clear-cut example of why network neutrality is necessary. In this case, Verizon redefines the long standard behaviour of DNS in order to redirect traffic to a site from which they derive profit. This example is simpler than traffic shaping instances which are often explained as network management issues (I don't consider this a legitimate excuse. Many politicians may though).