An excellent comment piece in yesterday's Guardian by Prof. Justin Lewis highlights the paradox of declining terrorist attacks amidst ever growing media coverage of terrorism. Unfortunately the online version doesn't have the little graph that accompanied the print piece but it's still worth a read.
Of course media coverage is never going to be simplistically correlated to how often something occurs. Nevertheless Prof. Lewis' piece is useful in reigning in an excitable media stuffed with 'terrorism analysts' whilst also calming governments who are getting themselves in a sweat over the matter. Yes terrorism is an important and real threat, but so is global warming, and the greenhouse effect has more predictable risks than fevered imaginings of terrorist plots.