The NY Times has a fantastic photo essay of the Towers.
My first real memory of the Towers comes from a time when I really visited NY for the first time as an adult. I was in school at Brandeis and decided to come down to Brooklyn with a friend who was from Brooklyn Heights (Hi Adam!). He lived just across the Brooklyn Bridge from lower Manhattan and one day we decided to ride bikes across the bridge to the Trade Center.
We did and it was magnificent.