I personally don't care what they do, as long as they keep me from having to live that day a second time.

The only certain way of doing that would be to ban all flying. To make doubly certain you could also close your borders & prevent anyone leaving or visiting your country. While you're about it ban all vehicles which could be used as bombs, another favourite terrorist weapon. I believe that this type of thinking would be a big mistake & achieve nothing.
We are now faced with a different type of warfare & the sole objective is an attack on the heart of our Western society. The destruction of the WTC was a terrible demonstration of what can be achieved by a few determined people at very little cost to themselves, except their own lives. It affects the whole Western world, not simply the US & what happened must have exceeded their wildest dreams. Like many others all over the world I watched the whole thing live on TV & apart from NYC residents & their relatives it affected me as much as anyone else.
Unlike other terrorist organisations these people cannot be bargained with & are not afraid to die for their cause. This makes it very difficult to prevent as nobody knows who they are or where they might strike next. Osama Bin Laden & other leaders are not the ones carrying out these attacks. They persuade others to do their work for them, preferably young idealistic followers with no previous criminal records, so they would not be on any security list. The safest flight to be on would probably be sitting next to Bin Laden himself.
The security services are in an impossible no-win situation & whatever they do they will be criticised. Whatever measures they take, I feel that they should be very careful not to abuse the rights of ordinary people or interfere with their everyday lives. This is exactly what these people want & means they have already succeeded.