E-911 has been a very hot button in the VoIP industry recently.  There are many issues that various VoIP SPs have been having with the recent E-911 ruling.  Granted a bit more clarity would have been helpful, and the 120-day requirement might be over-ambitious, but to a certain extent, the longer term picture is positive for the VoIP industry (maybe I am showing a bit of my Brazilian bias here, erring always on the side of optimism ;-) but the availability of 911 services from various carriers should help drive VoIP into the mainstream.  Moreover, this will mark the evolution to the next stage of market development, one in which value-added applications take hold, and the value proposition shifts from OPEX savings to productivity gains.

Finally, this mandate will obviously favor VoIP enablers such as Net2Phone and deltathree, as it will lend itself to the enabler model and could drive extra business for both companies. Of course, it will add more complexity to the deployment of VoIP services, but the fact of the matter is that it will also drive more business to 911 enablers such as Intrado and TCS (TeleCommunications Systems).