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No special development tools are required in order to take advantage of Google's mapping API; all that is necessary is a text editor, Web browser, and a public Web server from which the scripts can be served. Note the server must be public, you can't develop on an internal server, as each request must communicate with the Google mapping server in order to work correctly. You will however need an API key provided by Google so that usage quotas can be monitored. Begin by reading through some of the usage rules and applying for the key here: http://www.google.com/apis/maps/signup.html