Beyond outrage, sympathy and admiration for the Brits, and a hope that anti-terror policy in Britain will improve, I have nothing to add to what has been written already.
Norm Geras has already expressed all the outrage I can muster.
Michelle Malkin captures the extent to which Britain has made the mistake of allowing terrorists to settle there.
Balloon Juice nails the somehow-the-Jews-are-to-blame-for-this crowd.