Manhattan Timeformations - Uses computer models and interactive animations to examine the relationship between the city's skyscrapers and the environment as a whole. - http://www.skyscraper.org/timeformations/intro.html
Citidex - Includes area maps and yellow pages directory. - http://www.citidex.com/
Virtual New York - An interactive system to walk the streets of Manhattan - http://www.net-cities.com/virtual/new_york/