Sitting here at the computer watching the images of the aftermath of the bus and subway explosions in London brings back eerie memories of September 11th and the Madrid train bombings. If this does turn out to be Al Qaeda, which seems likely at this point, then it is at the very least a reminder that the war on terror is far from over.
Update: Up-to-the minute updates on the London bombings, including links to London bloggers, can be found at Instapundit.

