I recently finished Benjamin and Simon’s The Sacred Age of Terror, which seems to be a good overview of the terrorism of our day. I do not think that anyone will finish this book with any sense of optimism for the long haul, even in spite of recent military victories.
It’s the unfortunate nature of our modern world, but the site for PBS’s Avoiding Armageddon series provides good info and resources on weapons of mass destruction, terrorism and the like. There’s also a companion book.