There have been some poignant, thoughtful responses to the London bombing posted on various blogs here and there. Check out what Progressive Christian has. Beth Quick is always very thoughtful. Robert Fisk wrote something a little more spicy, but a thought provoking read nonetheless.
Check these out by clicking on the links I have put in this text. These writings are toward the "liberal" side of things, since that is my own unapolegetic perspective. If there are other essays you want to point out, be sure to include them in comments here.