9/11 Anniversary attacks? Or just more "Be Very Afraid..."?

http://abcnews.go.com/Blotter/feds-threat-al-qaeda-terror-attack-911/story?id=14477592

I can't remember a 9/11 date over the past decade that there hasn't been talk of "chatter" and "possible attacks" in the media.  While I'm extremely thankful we haven't seen additional attacks on the scale of 9/11/01 part of me wonders if the "powers that be" want to appear to be diligent and on top of things so they occasionally create the perception of imminent threats which then fade away after the anniversary passes. 
Regardless, if there was going to be a time for another attack a significant date like this weekend could be it so be careful, especially if you live in any population center (or are visiting one like the opening weekend of NFL games...)