What is the difference between the FAA FNS NOTAM and the FAA PilotWeb NOTAM websites?
I got this response via email from the FAA:


  PilotWeb is considered a Legacy Application based on the USNS, United States NOTAM System. The FNS, Federal NOTAM System, NOTAM Search is a new application. Many Legacy applications will eventually be replaced with the newer FNS applications over the next year. Both applications should be able to provide you with the information you are looking for.