It appears that someone has kicked the big red Ethernet cable out of the wall over at Cisco.  Currently, attempts to reach their website fall a few hops short.  We'll update if we hear anything...

Update: They're baaaaaaaaaaaaaack... The best word we have is that Cisco was having an "issue" that was not attributable to anything "evil."  Personally, I'm sticking with my "someone tripped over the Ethernet cable" explanation, 'cause it sounds plausible...