Here are some good links about the attacks against New York City and Washington. I'll add more when I find them.

Rational Voices

• Enter Stage Right: Don't let the terrorists achieve their greatest victory
  
  War has been declared on the United States. Greater than Pearl Harbor, incredibly greater than Oklahoma City, perhaps as significant as the Civil War, this country has been immobilized. In the immediate time frame we will be grappling with the terrible loss of life and the damage to all places the Pentagon and the World Trade Center. But as has been the case with every conflict beginning with the Civil War, the long-range pressures of this war will be to greatly expand the powers of the federal government and to restrict our freedoms.
  
  

• Enter Stage Right: Back to sanity...the only course
  
  After your disbelief in reality succumbs to the horror of what has actually happened, the first instinct is fear. As we learn that the immediate threats have passed, the fear slowly dissolves into anger. Our first numb thought is to immediately retaliate against anyone and everyone who has wished us harm or celebrated our injury. Revenge, swift and certain and complete. The only wisdom that can seep through the misery and sorrow and anger is to see justice done.
  
  

• Capitalism Magazine: Acts of War
  
  It is worse than Pearl Harbor. Our enemies have attacked, not a military base far out in the Pacific, but the very center of our civilization: our nation's political capital in Washington and its commercial capital in New York City.
  
  
  

• Capitalism Magazine: How To Make a Real War on Terrorism
  
  If this is now to be war, however, then we must make it a war. And our armed response to it must be prolonged, repeated, devastating and non-proportional.
  
  
  

• Capitalism Magazine: September 11th, 2001: The Day the "Great Satan" Arose From Its Sleep
  
  On Dec. 7, 1941, Winston Churchill called President Franklin Delano Roosevelt. "What's all this about Pearl Harbor?" the prime minister asked. "It's quite true, they bombed us," FDR replied. "We're all in the same boat now." Today, it's America and Israel that occupy the same small craft in a storm-tossed sea. Sept. 11, 2001, was another day of infamy -- New York's World Trade Center demolished by two hijacked planes, while another crashed into the Pentagon -- with thousands dead.
  
  
  

• Reason.com: Live from the Capitol Building
  
  "I thought it was a fire drill."
  
  

• PRODOS.com: Leonard Peikoff on the 9/11/2001 Terrorist Act of War against the United States
  
  Australian Objectivist and free-market advocate PRODOS interviews Leonard Peikoff, founder of the Ayn Rand Institute. An good look at the philosophical roots of this murderous attack.
  
  

• SaveTheHumans.com
  
  A simple but effective eyewitness account of what happened.

Geek Links

• UncleBear.com: Uncle Bear's Discussion Board for 911 - Day of Terror
  Uncle Bear's community always has good conversations.
  
  
• Slashdot: More Links And Reports On Terrorist Attacks:
  Excellent web resources gathered by geeks.
  
  
• Slashdot: Our New Pearl Harbor
  Heated, passionate article by members of the online community.
  
  
• Aintitcoolnews: Our Sympathies To The Victims Of Today's Terrorist Attacks In New York and Washington DC-Updated
  Another outpouring of disbelief, news and fury over the disaster.