Google Maps

Google sure knows how to organise the entire world's information. I just came across Google Maps recently, and it was impressive. It has a very neat user interface, which assists you in viewing a map of the world. It has a very high level of zoom - you could zoom into a country, then a state, then a city and then even into a street. It can even help you search for a location in a particular area and provide directions. Viewing satellite images of the area is also another option. The speed at which Google renders the zoomed section of the map is quite phenomenal.

These were my first few map searches:

San Francisco Bay Area, California

Central Park, Manhattan, New York City

Wall Street, Lower Manhattan, New York City

London, United Kingdom

The only drawback of Google Maps is that their database covers only North America and Europe as of now.