According to AvWeb...


"About midnight last night, the FAA Notam system crashed," AOPA's Chris
Dancy told AVweb early on Friday morning. "Pilots need to know that the
system is not being updated, and we don't know at this point how long it
will be before it is back on line." Flight service briefers at Lockheed
Martin are advising pilots who call for briefings that Notams are not
available, Dancy said. The AFSS Web site is also carrying an alert The
system failure affects security TFRs as well as safety-of-flight notices.